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ccx-incident-145

ccx-incident-145_268211 | Trial: ccx-incident-145__dTC8fDa | Score: 0.1667

Task Information

Task instruction sent to agent
# Grafana Alert Evaluation Cycle Overrun

## Your Task

Grafana logs warn 'alert evaluation took longer than expected'. Find the Go source files in grafana/grafana that (1) implement the alerting evaluation scheduler tick and (2) detect and log when an evaluation cycle overruns its time budget.

## Context

You are working on a codebase task involving repos from the incident domain.

## Available Resources

## Output Format

Use the published task contract:

- `TASK_WORKDIR=/workspace`
- `TASK_REPO_ROOT=/workspace`
- `TASK_OUTPUT=/workspace/answer.json`

Create a file at `TASK_OUTPUT` (`/workspace/answer.json`) with your findings in the following structure:

```json
{
  "files": [
    {"repo": "org/repo-name", "path": "relative/path/to/file.go"}
  ],
  "symbols": [
    {"repo": "org/repo-name", "path": "relative/path/to/file.go", "symbol": "SymbolName"}
  ],
  "chain": [
    {"repo": "org/repo-name", "path": "relative/path/to/file.go", "symbol": "FunctionName"}
  ],
  "text": "Narrative explanation of your findings, citing repos and file paths."
}
```

Include only the fields relevant to this task. Your answer is evaluated against a closed-world oracle — completeness matters.

## Evaluation

Your answer will be scored on:
- **File recall and precision**: Did you find all relevant files?

Execution Metrics

Reward
0.1667
Status
passed
Config
ccx-incident-145_268211
Model
anthropic/claude-fable-5
Agent Time
1.9m
Env Setup
12.2m
Input Tokens
590,951
Output Tokens
17,836
Cache Tokens
584,976
Cost
$1.16
Tool Calls
12 (0 MCP)
MCP Ratio
0.000
Context Peak
20%
Cache Hit
91%
Turns
12
Timed Out
No
Tool Breakdown
ToolCalls
Bash7
Read4
Write1

Agent Trace

Conversation History (28)
#TimestampTypeSubtypeToolText
1-systeminit-
2-assistanttext-
I'll look at the workspace structure first to find the grafana repo.
3-assistanttool_useBash
42026-06-12T17:41:39.117Zusertool_resultBash
grafana--26d36ec
5-assistanttool_useBash
62026-06-12T17:41:44.015Zusertool_resultBash
AGENTS.md
CHANGELOG.md
CODE_OF_CONDUCT.md
CONTRIBUTING.md
Dockerfile
GOVERNANCE.md
HALL_OF_FAME.md
LICENSE
LICENSING.md
MAINTAINERS.md
Makefile
NOTICE.md
README.md
ROADMAP.md
SECURITY.md
SUPPORT.md
WORKFLOW.md
apps
build.go
conf
contribute
crowdin.yml
cue.mod
cypress.config.js
devenv
docs
e2e
e2e-playwright
emails
embed.go
alert_rule.go
alert_rule_test.go
alerts_sender_mock.go
fetcher.go
jitter.go
jitter_test.go
loaded_metrics_reader.go
loaded_metrics_reader_test.go
metrics.go
metrics_test.go
recording_rule.go
recording_rule_test.go
registry.go
registry_bench_test.go
registry_test.go
retry.go
retry_test.go
schedule.go
schedule_unit_test.go
sequence.go
sequence_test.go
testing.go
ticker
7-assistanttool_useBash
82026-06-12T17:41:50.082Zusertool_resultBash
(Bash completed with no output)
9-assistanttool_useBash
102026-06-12T17:41:57.624Zusertool_resultBash
metrics.go
ticker.go
ticker_test.go
11-assistanttool_useBash
122026-06-12T17:42:04.171Zusertool_resultBash
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/schedule.go:256:			sch.metrics.BehindSeconds.Set(start.Sub(tick).Seconds())
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/ticker_test.go:102:	t.Run("should put the tick in the channel immediately if it is behind", func(t *testing.T) {
13-assistanttool_useRead
142026-06-12T17:42:08.589Zusertool_resultRead
1	package ticker
2	
3	import (
4		"fmt"
5		"time"
6	
7		"github.com/benbjohnson/clock"
8	
9		"github.com/grafana/grafana/pkg/infra/log"
10	)
11	
12	// Ticker emits ticks at regular time intervals. it's like a time.Ticker, except:
13	//   - it doesn't drop ticks for slow receivers, rather, it queues up.  so that callers are in control to instrument what's going on.
14	//   - it ticks on interval marks or very shortly after. this provides a predictable load pattern
15	//     (this shouldn't cause too much load contention issues because the next steps in the pipeline just process at their own pace)
16	//   - the timestamps are used to mark "last datapoint to query for" and as such, are a configurable amount of seconds in the past
17	type T struct {
18		C        chan time.Time
19		clock    clock.Clock
20		last     time.Time
21		interval time.Duration
22		metrics  *Metrics
23		stopCh   chan struct{}
24		logger   log.Logger
25	}
26	
27	// NewTicker returns a Ticker that ticks on interval marks (or very shortly after) starting at c.Now(), and never drops ticks. interval should not be negative or zero.
28	func New(c clock.Clock, interval time.Duration, metric *Metrics, logger log.Logger) *T {
29		if interval <= 0 {
30			panic(fmt.Errorf("non-positive interval [%v] is not allowed", interval))
31		}
32		t := &T{
33			C:        make(chan time.Time),
34			clock:    c,
35			last:     getStartTick(c, interval),
36			interval: interval,
37			metrics:  metric,
38			stopCh:   make(chan struct{}),
39			logger:   logger,
40		}
41		metric.IntervalSeconds.Set(t.interval.Seconds()) // Seconds report fractional part as well, so it matches the format of the timestamp we report below
42		go t.run()
43		return t
44	}
45	
46	func getStartTick(clk clock.Clock, interval time.Duration) time.Time {
47		nano := clk.Now().UnixNano()
48		return time.Unix(0, nano-(nano%interval.Nanoseconds()))
49	}
50	
51	func (t *T) run() {
52		t.logger.Info("starting", "component", "ticker", "first_tick", t.last.Add(t.interval))
53	LOOP:
54		for {
55			next := t.last.Add(t.interval) // calculate the time of the next tick
56			t.metrics.NextTickTime.Set(float64(next.UnixNano()) / 1e9)
57			diff := t.clock.Now().Sub(next) // calculate the difference between the current time and the next tick
58			// if difference is not negative, then it should tick
59			if diff >= 0 {
60				select {
61				case t.C <- next:
62				case <-t.stopCh:
63					break LOOP
64				}
65				t.last = next
66				t.metrics.LastTickTime.Set(float64(next.UnixNano()) / 1e9)
67				continue
68			}
69			// tick is too young. try again when ...
70			select {
71			case <-t.clock.After(-diff): // ...it'll definitely be old enough
72			case <-t.stopCh:
73				break LOOP
74			}
75		}
76		t.logger.Info("stopped", "component", "ticker", "last_tick", t.last)
77	}
78	
79	// Stop stops the ticker. It does not close the C channel
80	func (t *T) Stop() {
81		select {
82		case t.stopCh <- struct{}{}:
83		default:
84			// already stopped
85		}
86	}
87	
15-assistanttool_useRead
162026-06-12T17:42:08.949Zusertool_resultRead
1	package schedule
2	
3	import (
4		"context"
5		"fmt"
6		"net/url"
7		"time"
8	
9		"github.com/benbjohnson/clock"
10		"golang.org/x/sync/errgroup"
11	
12		"github.com/grafana/grafana-plugin-sdk-go/data"
13	
14		"github.com/grafana/grafana/pkg/infra/log"
15		"github.com/grafana/grafana/pkg/infra/tracing"
16		"github.com/grafana/grafana/pkg/services/featuremgmt"
17		"github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
18		"github.com/grafana/grafana/pkg/services/ngalert/eval"
19		"github.com/grafana/grafana/pkg/services/ngalert/metrics"
20		ngmodels "github.com/grafana/grafana/pkg/services/ngalert/models"
21		"github.com/grafana/grafana/pkg/services/ngalert/schedule/ticker"
22		"github.com/grafana/grafana/pkg/services/ngalert/state"
23		"github.com/grafana/grafana/pkg/setting"
24	)
25	
26	// ScheduleService is an interface for a service that schedules the evaluation
27	// of alert rules.
28	type ScheduleService interface {
29		// Run the scheduler until the context is canceled or the scheduler returns
30		// an error. The scheduler is terminated when this function returns.
31		Run(context.Context) error
32	}
33	
34	// AlertsSender is an interface for a service that is responsible for sending notifications to the end-user.
35	//
36	//go:generate mockery --name AlertsSender --structname AlertsSenderMock --inpackage --filename alerts_sender_mock.go --with-expecter
37	type AlertsSender interface {
38		Send(ctx context.Context, key ngmodels.AlertRuleKey, alerts definitions.PostableAlerts)
39	}
40	
41	// RulesStore is a store that provides alert rules for scheduling
42	type RulesStore interface {
43		GetAlertRulesKeysForScheduling(ctx context.Context) ([]ngmodels.AlertRuleKeyWithVersion, error)
44		GetAlertRulesForScheduling(ctx context.Context, query *ngmodels.GetAlertRulesForSchedulingQuery) error
45	}
46	
47	type RecordingWriter interface {
48		WriteDatasource(ctx context.Context, dsUID string, name string, t time.Time, frames data.Frames, orgID int64, extraLabels map[string]string) error
49	}
50	
51	// AlertRuleStopReasonProvider is an interface for determining the reason why an alert rule was stopped.
52	type AlertRuleStopReasonProvider interface {
53		// FindReason returns two values:
54		// 1. The first value is the reason for stopping the alert rule (error type).
55		// 2. The second value is an error indicating any issues that occurred while determining the stop reason.
56		//	  If this is non-nil, the scheduler uses the default reason.
57		FindReason(ctx context.Context, logger log.Logger, key ngmodels.AlertRuleKeyWithGroup) (error, error)
58	}
59	
60	type schedule struct {
61		// base tick rate (fastest possible configured check)
62		baseInterval time.Duration
63	
64		// each rule gets its own channel and routine
65		registry ruleRegistry
66	
67		retryConfig RetryConfig
68	
69		clock clock.Clock
70	
71		// evalApplied is only used for tests: test code can set it to non-nil
72		// function, and then it'll be called from the event loop whenever the
73		// message from evalApplied is handled.
74		evalAppliedFunc func(ngmodels.AlertRuleKey, time.Time)
75	
76		// stopApplied is only used for tests: test code can set it to non-nil
77		// function, and then it'll be called from the event loop whenever the
78		// message from stopApplied is handled.
79		stopAppliedFunc func(ngmodels.AlertRuleKey)
80	
81		ruleStopReasonProvider AlertRuleStopReasonProvider
82	
83		log log.Logger
84	
85		evaluatorFactory eval.EvaluatorFactory
86	
87		ruleStore RulesStore
88	
89		stateManager *state.Manager
90	
91		appURL               *url.URL
92		disableGrafanaFolder bool
93		jitterEvaluations    JitterStrategy
94		rrCfg                setting.RecordingRuleSettings
95	
96		metrics *metrics.Scheduler
97	
98		alertsSender    AlertsSender
99		minRuleInterval time.Duration
100	
101		// schedulableAlertRules contains the alert rules that are considered for
102		// evaluation in the current tick. The evaluation of an alert rule in the...
17-assistanttool_useBash
182026-06-12T17:42:23.266Zusertool_resultBash
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:29:	EvaluationDuration  time.Duration
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:41:	evaluationDuration  *atomic.Duration
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:82:		evaluationDuration:  atomic.NewDuration(0),
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:109:		EvaluationDuration:  r.evaluationDuration.Load(),
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:115:	var droppedMsg *Evaluation
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:117:	case droppedMsg = <-r.evalCh:
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:123:		return true, droppedMsg
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:125:		return false, droppedMsg
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:174:	evalDuration := r.metrics.EvalDuration.WithLabelValues(orgID)
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:185:		evalDuration.Observe(dur.Seconds())
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:187:		r.evaluationDuration.Store(dur)
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:284:	logger.Debug("Recording rule query completed", "resultCount", len(result.Responses), "duration", evalDur)
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:311:	logger.Debug("Metrics written", "duration", writeDur)
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:328:		logger.Error("Failed to evaluate rule", "error", err, "duration", r.clock.Now().Sub(start))
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:199:// the second element contains a dropped message that was sent by a concurrent sender.
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:206:	var droppedMsg *Evaluation
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:208:	case droppedMsg = <-a.evalCh:
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:214:		return true, droppedMsg
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:216:		return false, droppedMsg
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:285:				evalDuration := a.metrics.EvalDuration.WithLabelValues(orgID)
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:290:					evalDuration.Observe(a.clock.Now().Sub(evalStart).Seconds())
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:347:						logger.Debug("Tick processed", "attempt", attempt, "duration", a.clock.Now().Sub(evalStart))
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:397:	processDuration := a.metrics.ProcessDuration.WithLabelValues(orgID)
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:398:	sendDuration := a.metrics.SendDuration.WithLabelValues(orgID)
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:405:	var dur time.Duration
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:413:			logger.Error("Failed to evaluate rule", "error", err, "duration", dur)
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:459:		logger.Debug("Alert rule evaluated", "error", err, "duration", dur)
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:463:		logger.Debug("Alert rule evaluated", "results", len(results), "duration", dur)
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:481:			sendDuration.Observe(a.clock.Now().Sub(start).Seconds())
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:484:	processDuration.Observe(a.clock.Now().Sub(start).Seconds())
19-assistanttool_useBash
202026-06-12T17:42:28.869Zusertool_resultBash
/workspace/grafana--26d36ec/pkg/apiserver/rest/dualwriter_syncer.go:115:	// ensure that execution takes no longer than necessary
/workspace/grafana--26d36ec/pkg/registry/apis/dashboard/authorizer.go:19:			// Note that we will return Allow more than expected.
/workspace/grafana--26d36ec/pkg/services/ngalert/metrics/scheduler.go:17:	BehindSeconds                       prometheus.Gauge
/workspace/grafana--26d36ec/pkg/services/ngalert/metrics/scheduler.go:41:		BehindSeconds: promauto.With(r).NewGauge(prometheus.GaugeOpts{
/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/schedule.go:256:			sch.metrics.BehindSeconds.Set(start.Sub(tick).Seconds())
/workspace/grafana--26d36ec/pkg/services/secrets/manager/manager.go:567:	// is longer than a certain "caution period", because cache "by label"
/workspace/grafana--26d36ec/pkg/storage/unified/apistore/store.go:671:// If watch is lagging, progress status might:
/workspace/grafana--26d36ec/pkg/util/shortid_generator.go:22:	ErrUIDTooLong       = fmt.Errorf("UID is longer than %d symbols", MaxUIDLength)
21-assistanttool_useRead
222026-06-12T17:42:44.702Zusertool_resultRead
195	// Returns a tuple where first element is
196	//   - true when message was sent
197	//   - false when the send operation is stopped
198	//
199	// the second element contains a dropped message that was sent by a concurrent sender.
200	func (a *alertRule) Eval(eval *Evaluation) (bool, *Evaluation) {
201		if a.key.AlertRuleKey != eval.rule.GetKey() {
202			// Make sure that rule has the same key. This should not happen
203			panic(fmt.Sprintf("Invalid rule sent for evaluating. Expected rule key %s, got %s", a.key.AlertRuleKey, eval.rule.GetKey()))
204		}
205		// read the channel in unblocking manner to make sure that there is no concurrent send operation.
206		var droppedMsg *Evaluation
207		select {
208		case droppedMsg = <-a.evalCh:
209		default:
210		}
211	
212		select {
213		case a.evalCh <- eval:
214			return true, droppedMsg
215		case <-a.ctx.Done():
216			return false, droppedMsg
217		}
218	}
219	
220	// update sends an instruction to the rule evaluation routine to update the scheduled rule to the specified version. The specified version must be later than the current version, otherwise no update will happen.
221	func (a *alertRule) Update(eval *Evaluation) bool {
222		// check if the channel is not empty.
223		select {
224		case <-a.updateCh:
23-assistanttool_useRead
242026-06-12T17:42:45.234Zusertool_resultRead
1	package ticker
2	
3	import (
4		"github.com/prometheus/client_golang/prometheus"
5		"github.com/prometheus/client_golang/prometheus/promauto"
6	)
7	
8	type Metrics struct {
9		LastTickTime    prometheus.Gauge
10		NextTickTime    prometheus.Gauge
11		IntervalSeconds prometheus.Gauge
12	}
13	
14	func NewMetrics(reg prometheus.Registerer, subsystem string) *Metrics {
15		return &Metrics{
16			LastTickTime: promauto.With(reg).NewGauge(prometheus.GaugeOpts{
17				Namespace: "grafana",
18				Subsystem: subsystem,
19				Name:      "ticker_last_consumed_tick_timestamp_seconds",
20				Help:      "Timestamp of the last consumed tick in seconds.",
21			}),
22			NextTickTime: promauto.With(reg).NewGauge(prometheus.GaugeOpts{
23				Namespace: "grafana",
24				Subsystem: subsystem,
25				Name:      "ticker_next_tick_timestamp_seconds",
26				Help:      "Timestamp of the next tick in seconds before it is consumed.",
27			}),
28			IntervalSeconds: promauto.With(reg).NewGauge(prometheus.GaugeOpts{
29				Namespace: "grafana",
30				Subsystem: subsystem,
31				Name:      "ticker_interval_seconds",
32				Help:      "Interval at which the ticker is meant to tick.",
33			}),
34		}
35	}
36	
25-assistanttext-
I have the full picture. Now writing the answer file.
26-assistanttool_useWrite
272026-06-12T17:43:16.674Zusertool_resultWrite
File created successfully at: /workspace/answer.json (file state is current in your context — no need to Read it back)
28-assistanttext-
Found them. The answer is written to `/workspace/answer.json`.

**TLDR:** In grafana/grafana (checkout at `/workspace/grafana--26d36ec`), the alerting evaluation scheduler tick and the overrun detection both live in the ngalert scheduler package:

1. **Scheduler tick implementation**
   - `pkg/services/ngalert/schedule/ticker/ticker.go` — the custom `ticker.T`. Unlike `time.Ticker`, it never drops ticks for slow receivers; it queues them precisely so callers can detect when evaluation falls behind. Its `run()` loop delivers any tick whose time has already passed immediately.
   - `pkg/services/ngalert/schedule/schedule.go` — `Run()` creates the ticker at the base interval, and `schedulePeriodic()` is the loop that consumes each tick from `t.C` and calls `processTick()` to dispatch rule evaluations.

2. **Overrun detection and logging**
   - `schedule.go:256` — each tick, `schedulePeriodic()` measures `start.Sub(tick)` and sets the `BehindSeconds` gauge (how late the cycle started), plus observes `SchedulePeriodicDuration`.
   - `alert_rule.go:200` (`alertRule.Eval`) and the analogous `recording_rule.go` — before sending a new evaluation into the rule's channel, `Eval` drains any still-unconsumed previous evaluation, which means the prior cycle overran its interval; it returns that as a dropped message.
   - `schedule.go:438` — `runJobFn()` checks the dropped result and logs the warning **"Tick dropped because alert rule evaluation is too slow"**, incrementing the `EvaluationMissed` counter (metrics defined in `pkg/services/ngalert/metrics/scheduler.go`).

One caveat, noted in the answer file: the literal string "alert evaluation took longer than expected" doesn't appear in this revision — the corresponding overrun warning in this code is the dropped-tick message above, backed by the `BehindSeconds`/`EvaluationMissed` instrumentation.
Tool Calls (12)
1. Bash @ -
Input
{
  "command": "ls /workspace && ls /workspace/grafana 2>/dev/null | head -30",
  "description": "List workspace contents"
}
Output
{
  "stdout": "grafana--26d36ec",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}
2. Bash @ -
Input
{
  "command": "ls /workspace/grafana--26d36ec | head -30 && ls /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ 2>/dev/null",
  "description": "List repo and ngalert schedule dir"
}
Output
{
  "stdout": "AGENTS.md\nCHANGELOG.md\nCODE_OF_CONDUCT.md\nCONTRIBUTING.md\nDockerfile\nGOVERNANCE.md\nHALL_OF_FAME.md\nLICENSE\nLICENSING.md\nMAINTAINERS.md\nMakefile\nNOTICE.md\nREADME.md\nROADMAP.md\nSECURITY.md\nSUPPORT.md\nWORKFLOW.md\napps\nbuild.go\nconf\ncontribute\ncrowdin.yml\ncue.mod\ncypress.config.js\ndevenv\ndocs\ne2e\ne2e-playwright\nemails\nembed.go\nalert_rule.go\nalert_rule_test.go\nalerts_sender_mock.go\nfetcher.go\njitter.go\njitter_test.go\nloaded_metrics_reader.go\nloaded_metrics_reader_test.go\nmetrics.go\nmetrics_test.go\nrecording_rule.go\nrecording_rule_test.go\nregistry.go\nregistry_bench_test.go\nregistry_test.go\nretry.go\nretry_test.go\nschedule.go\nschedule_unit_test.go\nsequence.go\nsequence_test.go\ntesting.go\nticker",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}
3. Bash @ -
Input
{
  "command": "grep -rn \"longer than expected\" /workspace/grafana--26d36ec/pkg/ --include=*.go | head -20",
  "description": "Find overrun warning log message"
}
Output
{
  "stdout": "",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}
4. Bash @ -
Input
{
  "command": "ls /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/ && grep -rn \"took longer\\|overrun\\|behind\\|missed tick\\|elapsed\" /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ --include=*.go | grep -iv test | head -30",
  "description": "Inspect ticker dir and search for overrun detection"
}
Output
{
  "stdout": "metrics.go\nticker.go\nticker_test.go",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}
5. Bash @ -
Input
{
  "command": "grep -rn -i \"behind\\|overrun\\|too long\\|longer\\|lag\" /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/*.go /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/schedule.go | head -20",
  "description": "Search ticker and schedule for lag/overrun terms"
}
Output
{
  "stdout": "/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/schedule.go:256:\t\t\tsch.metrics.BehindSeconds.Set(start.Sub(tick).Seconds())\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/ticker_test.go:102:\tt.Run(\"should put the tick in the channel immediately if it is behind\", func(t *testing.T) {",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}
6. Read @ -
Input
{
  "file_path": "/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/ticker.go"
}
Output
{
  "type": "text",
  "file": {
    "filePath": "/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/ticker.go",
    "content": "package ticker\n\nimport (\n\t\"fmt\"\n\t\"time\"\n\n\t\"github.com/benbjohnson/clock\"\n\n\t\"github.com/grafana/grafana/pkg/infra/log\"\n)\n\n// Ticker emits ticks at regular time intervals. it's like a time.Ticker, except:\n//   - it doesn't drop ticks for slow receivers, rather, it queues up.  so that callers are in control to instrument what's going on.\n//   - it ticks on interval marks or very shortly after. this provides a predictable load pattern\n//     (this shouldn't cause too much load contention issues because the next steps in the pipeline just process at their own pace)\n//   - the timestamps are used to mark \"last datapoint to query for\" and as such, are a configurable amount of seconds in the past\ntype T struct {\n\tC        chan time.Time\n\tclock    clock.Clock\n\tlast     time.Time\n\tinterval time.Duration\n\tmetrics  *Metrics\n\tstopCh   chan struct{}\n\tlogger   log.Logger\n}\n\n// NewTicker returns a Ticker that ticks on interval marks (or very shortly after) starting at c.Now(), and never drops ticks. interval should not be negative or zero.\nfunc New(c clock.Clock, interval time.Duration, metric *Metrics, logger log.Logger) *T {\n\tif interval <= 0 {\n\t\tpanic(fmt.Errorf(\"non-positive interval [%v] is not allowed\", interval))\n\t}\n\tt := &T{\n\t\tC:        make(chan time.Time),\n\t\tclock:    c,\n\t\tlast:     getStartTick(c, interval),\n\t\tinterval: interval,\n\t\tmetrics:  metric,\n\t\tstopCh:   make(chan struct{}),\n\t\tlogger:   logger,\n\t}\n\tmetric.IntervalSeconds.Set(t.interval.Seconds()) // Seconds report fractional part as well, so it matches the format of the timestamp we report below\n\tgo t.run()\n\treturn t\n}\n\nfunc getStartTick(clk clock.Clock, interval time.Duration) time.Time {\n\tnano := clk.Now().UnixNano()\n\treturn time.Unix(0, nano-(nano%interval.Nanoseconds()))\n}\n\nfunc (t *T) run() {\n\tt.logger.Info(\"starting\", \"component\", \"ticker\", \"first_tick\", t.last.Add(t.interval))\nLOOP:\n\tfor {\n\t\tnext := t.last.Add(t.interval) // calculate the time of the next tick\n\t\tt.metrics.NextTickTime.Set(float64(next.UnixNano()) / 1e9)\n\t\tdiff := t.clock.Now().Sub(next) // calculate the difference between the current time and the next tick\n\t\t// if difference is not negative, then it should tick\n\t\tif diff >= 0 {\n\t\t\tselect {\n\t\t\tcase t.C <- next:\n\t\t\tcase <-t.stopCh:\n\t\t\t\tbreak LOOP\n\t\t\t}\n\t\t\tt.last = next\n\t\t\tt.metrics.LastTickTime.Set(float64(next.UnixNano()) / 1e9)\n\t\t\tcontinue\n\t\t}\n\t\t// tick is too young. try again when ...\n\t\tselect {\n\t\tcase <-t.clock.After(-diff): // ...it'll definitely be old enough\n\t\tcase <-t.stopCh:\n\t\t\tbreak LOOP\n\t\t}\n\t}\n\tt.logger.Info(\"stopped\", \"component\", \"ticker\", \"last_tick\", t.last)\n}\n\n// Stop stops the ticker. It does not close the C channel\nfunc (t *T) Stop() {\n\tselect {\n\tcase t.stopCh <- struct{}{}:\n\tdefault:\n\t\t// already stopped\n\t}\n}\n",
    "numLines": 87,
    "startLine": 1,
    "totalLines": 87
  }
}
7. Read @ -
Input
{
  "file_path": "/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/schedule.go"
}
Output
{
  "type": "text",
  "file": {
    "filePath": "/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/schedule.go",
    "content": "package schedule\n\nimport (\n\t\"context\"\n\t\"fmt\"\n\t\"net/url\"\n\t\"time\"\n\n\t\"github.com/benbjohnson/clock\"\n\t\"golang.org/x/sync/errgroup\"\n\n\t\"github.com/grafana/grafana-plugin-sdk-go/data\"\n\n\t\"github.com/grafana/grafana/pkg/infra/log\"\n\t\"github.com/grafana/grafana/pkg/infra/tracing\"\n\t\"github.com/grafana/grafana/pkg/services/featuremgmt\"\n\t\"github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions\"\n\t\"github.com/grafana/grafana/pkg/services/ngalert/eval\"\n\t\"github.com/grafana/grafana/pkg/services/ngalert/metrics\"\n\tngmodels \"github.com/grafana/grafana/pkg/services/ngalert/models\"\n\t\"github.com/grafana/grafana/pkg/services/ngalert/schedule/ticker\"\n\t\"github.com/grafana/grafana/pkg/services/ngalert/state\"\n\t\"github.com/grafana/grafana/pkg/setting\"\n)\n\n// ScheduleService is an interface for a service that schedules the evaluation\n// of alert rules.\ntype ScheduleService interface {\n\t// Run the scheduler until the context is canceled or the scheduler returns\n\t// an error. The scheduler is terminated when this function returns.\n\tRun(context.Context) error\n}\n\n// AlertsSender is an interface for a service that is responsible for sending notifications to the end-user.\n//\n//go:generate mockery --name AlertsSender --structname AlertsSenderMock --inpackage --filename alerts_sender_mock.go --with-expecter\ntype AlertsSender interface {\n\tSend(ctx context.Context, key ngmodels.AlertRuleKey, alerts definitions.PostableAlerts)\n}\n\n// RulesStore is a store that provides alert rules for scheduling\ntype RulesStore interface {\n\tGetAlertRulesKeysForScheduling(ctx context.Context) ([]ngmodels.AlertRuleKeyWithVersion, error)\n\tGetAlertRulesForScheduling(ctx context.Context, query *ngmodels.GetAlertRulesForSchedulingQuery) error\n}\n\ntype RecordingWriter interface {\n\tWriteDatasource(ctx context.Context, dsUID string, name string, t time.Time, frames data.Frames, orgID int64, extraLabels map[string]string) error\n}\n\n// AlertRuleStopReasonProvider is an interface for determining the reason why an alert rule was stopped.\ntype AlertRuleStopReasonProvider interface {\n\t// FindReason returns two values:\n\t// 1. The first value is the reason for stopping the alert rule (error type).\n\t// 2. The second value is an error indicating any issues that occurred while determining the stop reason.\n\t//\t  If this is non-nil, the scheduler uses the default reason.\n\tFindReason(ctx context.Context, logger log.Logger, key ngmodels.AlertRuleKeyWithGroup) (error, error)\n}\n\ntype schedule struct {\n\t// base tick rate (fastest possible configured check)\n\tbaseInterval time.Duration\n\n\t// each rule gets its own channel and routine\n\tregistry ruleRegistry\n\n\tretryConfig RetryConfig\n\n\tclock clock.Clock\n\n\t// evalApplied is only used for tests: test code can set it to non-nil\n\t// function, and then it'll be called from the event loop whenever the\n\t// message from evalApplied is handled.\n\tevalAppliedFunc func(ngmodels.AlertRuleKey, time.Time)\n\n\t// stopApplied is only used for tests: test code can set it to non-nil\n\t// function, and then it'll be called from the event loop whenever the\n\t// message from stopApplied is handled.\n\tstopAppliedFunc func(ngmodels.AlertRuleKey)\n\n\truleStopReasonProvider AlertRuleStopReasonProvider\n\n\tlog log.Logger\n\n\tevaluatorFactory eval.EvaluatorFactory\n\n\truleStore RulesStore\n\n\tstateManager *state.Manager\n\n\tappURL               *url.URL\n\tdisableGrafanaFolder bool\n\tjitterEvaluations    JitterStrategy\n\trrCfg                setting.RecordingRuleSettings\n\n\tmetrics *metrics.Scheduler\n\n\talertsSender    AlertsSender\n\tminRuleInterval time.Duration\n\n\t// schedulableAlertRules contains the alert rules that are considered for\n\t// evaluation in the current tick. The eval
...
8. Bash @ -
Input
{
  "command": "grep -n -i \"dropped\\|too slow\\|took\\|duration\\|behind\" /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/metrics.go /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/metrics.go | head -40",
  "description": "Find dropped-tick and duration logic in rule routines and metrics"
}
Output
{
  "stdout": "/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:29:\tEvaluationDuration  time.Duration\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:41:\tevaluationDuration  *atomic.Duration\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:82:\t\tevaluationDuration:  atomic.NewDuration(0),\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:109:\t\tEvaluationDuration:  r.evaluationDuration.Load(),\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:115:\tvar droppedMsg *Evaluation\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:117:\tcase droppedMsg = <-r.evalCh:\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:123:\t\treturn true, droppedMsg\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:125:\t\treturn false, droppedMsg\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:174:\tevalDuration := r.metrics.EvalDuration.WithLabelValues(orgID)\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:185:\t\tevalDuration.Observe(dur.Seconds())\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:187:\t\tr.evaluationDuration.Store(dur)\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:284:\tlogger.Debug(\"Recording rule query completed\", \"resultCount\", len(result.Responses), \"duration\", evalDur)\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:311:\tlogger.Debug(\"Metrics written\", \"duration\", writeDur)\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go:328:\t\tlogger.Error(\"Failed to evaluate rule\", \"error\", err, \"duration\", r.clock.Now().Sub(start))\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:199:// the second element contains a dropped message that was sent by a concurrent sender.\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:206:\tvar droppedMsg *Evaluation\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:208:\tcase droppedMsg = <-a.evalCh:\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:214:\t\treturn true, droppedMsg\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:216:\t\treturn false, droppedMsg\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:285:\t\t\t\tevalDuration := a.metrics.EvalDuration.WithLabelValues(orgID)\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:290:\t\t\t\t\tevalDuration.Observe(a.clock.Now().Sub(evalStart).Seconds())\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:347:\t\t\t\t\t\tlogger.Debug(\"Tick processed\", \"attempt\", attempt, \"duration\", a.clock.Now().Sub(evalStart))\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:397:\tprocessDuration := a.metrics.ProcessDuration.WithLabelValues(orgID)\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:398:\tsendDuration := a.metrics.SendDuration.WithLabelValues(orgID)\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:405:\tvar dur time.Duration\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:413:\t\t\tlogger.Error(\"Failed to evaluate rule\", \"error\", err, \"duration\", dur)\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:459:\t\tlogger.Debug(\"Alert rule evaluated\", \"error\", err, \"duration\", dur)\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:463:\t\tlogger.Debug(\"Alert rule evaluated\", \"results\", len(results), \"duration\", dur)\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go:481:\t\t\tsendDuration.Observe(a.clock.Now().Sub(start).Seconds())\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/al
...
9. Bash @ -
Input
{
  "command": "grep -rn -i \"longer than\\|than expected\\|miss.*tick\\|tick.*miss\\|behindSeconds\\|lagging\" /workspace/grafana--26d36ec/pkg/ --include=*.go | grep -v _test | head -20",
  "description": "Search whole pkg tree for overrun-style log messages"
}
Output
{
  "stdout": "/workspace/grafana--26d36ec/pkg/apiserver/rest/dualwriter_syncer.go:115:\t// ensure that execution takes no longer than necessary\n/workspace/grafana--26d36ec/pkg/registry/apis/dashboard/authorizer.go:19:\t\t\t// Note that we will return Allow more than expected.\n/workspace/grafana--26d36ec/pkg/services/ngalert/metrics/scheduler.go:17:\tBehindSeconds                       prometheus.Gauge\n/workspace/grafana--26d36ec/pkg/services/ngalert/metrics/scheduler.go:41:\t\tBehindSeconds: promauto.With(r).NewGauge(prometheus.GaugeOpts{\n/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/schedule.go:256:\t\t\tsch.metrics.BehindSeconds.Set(start.Sub(tick).Seconds())\n/workspace/grafana--26d36ec/pkg/services/secrets/manager/manager.go:567:\t// is longer than a certain \"caution period\", because cache \"by label\"\n/workspace/grafana--26d36ec/pkg/storage/unified/apistore/store.go:671:// If watch is lagging, progress status might:\n/workspace/grafana--26d36ec/pkg/util/shortid_generator.go:22:\tErrUIDTooLong       = fmt.Errorf(\"UID is longer than %d symbols\", MaxUIDLength)",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}
10. Read @ -
Input
{
  "file_path": "/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go",
  "offset": 195,
  "limit": 30
}
Output
{
  "type": "text",
  "file": {
    "filePath": "/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go",
    "content": "// Returns a tuple where first element is\n//   - true when message was sent\n//   - false when the send operation is stopped\n//\n// the second element contains a dropped message that was sent by a concurrent sender.\nfunc (a *alertRule) Eval(eval *Evaluation) (bool, *Evaluation) {\n\tif a.key.AlertRuleKey != eval.rule.GetKey() {\n\t\t// Make sure that rule has the same key. This should not happen\n\t\tpanic(fmt.Sprintf(\"Invalid rule sent for evaluating. Expected rule key %s, got %s\", a.key.AlertRuleKey, eval.rule.GetKey()))\n\t}\n\t// read the channel in unblocking manner to make sure that there is no concurrent send operation.\n\tvar droppedMsg *Evaluation\n\tselect {\n\tcase droppedMsg = <-a.evalCh:\n\tdefault:\n\t}\n\n\tselect {\n\tcase a.evalCh <- eval:\n\t\treturn true, droppedMsg\n\tcase <-a.ctx.Done():\n\t\treturn false, droppedMsg\n\t}\n}\n\n// update sends an instruction to the rule evaluation routine to update the scheduled rule to the specified version. The specified version must be later than the current version, otherwise no update will happen.\nfunc (a *alertRule) Update(eval *Evaluation) bool {\n\t// check if the channel is not empty.\n\tselect {\n\tcase <-a.updateCh:",
    "numLines": 30,
    "startLine": 195,
    "totalLines": 557
  }
}
11. Read @ -
Input
{
  "file_path": "/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/metrics.go"
}
Output
{
  "type": "text",
  "file": {
    "filePath": "/workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/metrics.go",
    "content": "package ticker\n\nimport (\n\t\"github.com/prometheus/client_golang/prometheus\"\n\t\"github.com/prometheus/client_golang/prometheus/promauto\"\n)\n\ntype Metrics struct {\n\tLastTickTime    prometheus.Gauge\n\tNextTickTime    prometheus.Gauge\n\tIntervalSeconds prometheus.Gauge\n}\n\nfunc NewMetrics(reg prometheus.Registerer, subsystem string) *Metrics {\n\treturn &Metrics{\n\t\tLastTickTime: promauto.With(reg).NewGauge(prometheus.GaugeOpts{\n\t\t\tNamespace: \"grafana\",\n\t\t\tSubsystem: subsystem,\n\t\t\tName:      \"ticker_last_consumed_tick_timestamp_seconds\",\n\t\t\tHelp:      \"Timestamp of the last consumed tick in seconds.\",\n\t\t}),\n\t\tNextTickTime: promauto.With(reg).NewGauge(prometheus.GaugeOpts{\n\t\t\tNamespace: \"grafana\",\n\t\t\tSubsystem: subsystem,\n\t\t\tName:      \"ticker_next_tick_timestamp_seconds\",\n\t\t\tHelp:      \"Timestamp of the next tick in seconds before it is consumed.\",\n\t\t}),\n\t\tIntervalSeconds: promauto.With(reg).NewGauge(prometheus.GaugeOpts{\n\t\t\tNamespace: \"grafana\",\n\t\t\tSubsystem: subsystem,\n\t\t\tName:      \"ticker_interval_seconds\",\n\t\t\tHelp:      \"Interval at which the ticker is meant to tick.\",\n\t\t}),\n\t}\n}\n",
    "numLines": 36,
    "startLine": 1,
    "totalLines": 36
  }
}
12. Write @ -
Input
{
  "file_path": "/workspace/answer.json",
  "content": "{\n  \"files\": [\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/ticker.go\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/alert_rule.go\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/recording_rule.go\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/metrics/scheduler.go\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/metrics.go\"}\n  ],\n  \"symbols\": [\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/ticker.go\", \"symbol\": \"T\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/ticker.go\", \"symbol\": \"New\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/ticker.go\", \"symbol\": \"run\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"Run\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"schedulePeriodic\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"processTick\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"runJobFn\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/alert_rule.go\", \"symbol\": \"Eval\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/recording_rule.go\", \"symbol\": \"Eval\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/metrics/scheduler.go\", \"symbol\": \"BehindSeconds\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/metrics/scheduler.go\", \"symbol\": \"EvaluationMissed\"}\n  ],\n  \"chain\": [\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/ticker.go\", \"symbol\": \"run\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"Run\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"schedulePeriodic\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"processTick\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"runJobFn\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/alert_rule.go\", \"symbol\": \"Eval\"}\n  ],\n  \"text\": \"The unified alerting (ngalert) scheduler in grafana/grafana drives rule evaluation off a custom ticker, and the overrun detection/logging lives in the scheduler tick loop and the per-rule Eval path.\\n\\n(1) Scheduler tick implementation: pkg/services/ngalert/schedule/ticker/ticker.go implements ticker.T, a custom replacement for time.Ticker that ticks on interval marks and never drops ticks for slow receivers — instead it queues them, explicitly so that downstream code can detect and instrument when evaluation falls behind (its run() loop computes diff := clock.Now().Sub(next) and delivers any tick whose time has already passed immediately). pkg/services/ngalert/schedule/ticker/metrics.go exposes the ticker's last/next tick timestamp gauges used to observe tick lag. The scheduler consumes this ticker in pkg/services/ngalert/schedule/schedule.go: Run() creates the ticker with the base interval, and schedulePeriodic() is the main loop that receives each tick from t.C and calls processTick() to fan evaluations out to per-rule goroutines.\\n\\n(2) Overrun detection and logging: in schedule.go, schedulePeriodic() measures how far behind the scheduler is on each tick (start.Sub(ti
...
Output
{
  "type": "create",
  "filePath": "/workspace/answer.json",
  "content": "{\n  \"files\": [\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/ticker.go\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/alert_rule.go\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/recording_rule.go\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/metrics/scheduler.go\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/metrics.go\"}\n  ],\n  \"symbols\": [\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/ticker.go\", \"symbol\": \"T\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/ticker.go\", \"symbol\": \"New\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/ticker.go\", \"symbol\": \"run\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"Run\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"schedulePeriodic\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"processTick\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"runJobFn\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/alert_rule.go\", \"symbol\": \"Eval\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/recording_rule.go\", \"symbol\": \"Eval\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/metrics/scheduler.go\", \"symbol\": \"BehindSeconds\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/metrics/scheduler.go\", \"symbol\": \"EvaluationMissed\"}\n  ],\n  \"chain\": [\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/ticker/ticker.go\", \"symbol\": \"run\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"Run\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"schedulePeriodic\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"processTick\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/schedule.go\", \"symbol\": \"runJobFn\"},\n    {\"repo\": \"grafana/grafana\", \"path\": \"pkg/services/ngalert/schedule/alert_rule.go\", \"symbol\": \"Eval\"}\n  ],\n  \"text\": \"The unified alerting (ngalert) scheduler in grafana/grafana drives rule evaluation off a custom ticker, and the overrun detection/logging lives in the scheduler tick loop and the per-rule Eval path.\\n\\n(1) Scheduler tick implementation: pkg/services/ngalert/schedule/ticker/ticker.go implements ticker.T, a custom replacement for time.Ticker that ticks on interval marks and never drops ticks for slow receivers — instead it queues them, explicitly so that downstream code can detect and instrument when evaluation falls behind (its run() loop computes diff := clock.Now().Sub(next) and delivers any tick whose time has already passed immediately). pkg/services/ngalert/schedule/ticker/metrics.go exposes the ticker's last/next tick timestamp gauges used to observe tick lag. The scheduler consumes this ticker in pkg/services/ngalert/schedule/schedule.go: Run() creates the ticker with the base interval, and schedulePeriodic() is the main loop that receives each tick from t.C and calls processTick() to fan evaluations out to per-rule goroutines.\\n\\n(2) Overrun detection and logging: in schedule.go, schedulePeriodic() measures how far behind the scheduler is on each
...
Code Changes (1)
1. WRITE /workspace/answer.json
{
  "files": [
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/ticker/ticker.go"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/schedule.go"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/alert_rule.go"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/recording_rule.go"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/metrics/scheduler.go"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/ticker/metrics.go"}
  ],
  "symbols": [
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/ticker/ticker.go", "symbol": "T"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/ticker/ticker.go", "symbol": "New"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/ticker/ticker.go", "symbol": "run"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/schedule.go", "symbol": "Run"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/schedule.go", "symbol": "schedulePeriodic"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/schedule.go", "symbol": "processTick"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/schedule.go", "symbol": "runJobFn"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/alert_rule.go", "symbol": "Eval"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/recording_rule.go", "symbol": "Eval"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/metrics/scheduler.go", "symbol": "BehindSeconds"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/metrics/scheduler.go", "symbol": "EvaluationMissed"}
  ],
  "chain": [
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/ticker/ticker.go", "symbol": "run"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/schedule.go", "symbol": "Run"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/schedule.go", "symbol": "schedulePeriodic"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/schedule.go", "symbol": "processTick"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/schedule.go", "symbol": "runJobFn"},
    {"repo": "grafana/grafana", "path": "pkg/services/ngalert/schedule/alert_rule.go", "symbol": "Eval"}
  ],
  "text": "The unified alerting (ngalert) scheduler in grafana/grafana drives rule evaluation off a custom ticker, and the overrun detection/logging lives in the scheduler tick loop and the per-rule Eval path.\n\n(1) Scheduler tick implementation: pkg/services/ngalert/schedule/ticker/ticker.go implements ticker.T, a custom replacement for time.Ticker that ticks on interval marks and never drops ticks for slow receivers — instead it queues them, explicitly so that downstream code can detect and instrument when evaluation falls behind (its run() loop computes diff := clock.Now().Sub(next) and delivers any tick whose time has already passed immediately). pkg/services/ngalert/schedule/ticker/metrics.go exposes the ticker's last/next tick timestamp gauges used to observe tick lag. The scheduler consumes this ticker in pkg/services/ngalert/schedule/schedule.go: Run() creates the ticker with the base interval, and schedulePeriodic() is the main loop that receives each tick from t.C and calls processTick() to fan evaluations out to per-rule goroutines.\n\n(2) Overrun detection and logging: in schedule.go, schedulePeriodic() measures how far behind the scheduler is on each tick (start.Sub(tick)) and records it in the BehindSeconds gauge, plus the SchedulePeriodicDuration histogram for the cycle's own duration. The per-cycle overrun is detected in alertRule.Eval() (pkg/services/ngalert/schedule/alert_rule.go) and the identical recordingRule.Eval() (pkg/services/ngalert/schedule/recording_rule.go): before sending a new scheduled evaluatio...
Bash Commands (7)
1. $ ls /workspace && ls /workspace/grafana 2>/dev/null | head -30
2. $ ls /workspace/grafana--26d36ec | head -30 && ls /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ 2>/dev/null
3. $ grep -rn "longer than expected" /workspace/grafana--26d36ec/pkg/ --include=*.go | head -20
4. $ ls /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/ && grep -rn "took longer\|overrun\|behind\|missed tick\|elapsed" /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ --include=*.go | grep -iv test | head -30
5. $ grep -rn -i "behind\|overrun\|too long\|longer\|lag" /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/*.go /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/schedule.go | head -20
6. $ grep -n -i "dropped\|too slow\|took\|duration\|behind" /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/alert_rule.go /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/recording_rule.go /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/metrics.go /workspace/grafana--26d36ec/pkg/services/ngalert/schedule/ticker/metrics.go | head -40
7. $ grep -rn -i "longer than\|than expected\|miss.*tick\|tick.*miss\|behindSeconds\|lagging" /workspace/grafana--26d36ec/pkg/ --include=*.go | grep -v _test | head -20