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rules: fix flaky TestAsyncRuleEvaluation on Windows#17965

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aknuds1:fix/flaky-async-rule-evaluation-test
Feb 16, 2026
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rules: fix flaky TestAsyncRuleEvaluation on Windows#17965
aknuds1 merged 1 commit into
prometheus:mainfrom
aknuds1:fix/flaky-async-rule-evaluation-test

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@aknuds1 aknuds1 commented Jan 29, 2026

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Which issue(s) does the PR fix:

Fixes #17961

Does this PR introduce a user-facing change?

NONE

Summary

Convert all timing-sensitive subtests of TestAsyncRuleEvaluation to use synctest for deterministic testing. This fixes flakiness on Windows caused by timer granularity and scheduling variance.

The timing assertions are preserved using synctest's fake time, which allows accurate verification of sequential vs concurrent execution timing without relying on wall-clock time.

@aknuds1
aknuds1 force-pushed the fix/flaky-async-rule-evaluation-test branch from 697439d to 8e13a0d Compare February 1, 2026 08:52
@aknuds1
aknuds1 force-pushed the fix/flaky-async-rule-evaluation-test branch from 8e13a0d to 5dc296a Compare February 15, 2026 15:10
Convert all timing-sensitive subtests of TestAsyncRuleEvaluation to use
synctest for deterministic testing. This fixes flakiness on Windows
caused by timer granularity and scheduling variance.

The timing assertions are preserved using synctest's fake time, which
allows accurate verification of sequential vs concurrent execution
timing without relying on wall-clock time.

Fixes prometheus#17961

Signed-off-by: Arve Knudsen <[email protected]>
@aknuds1
aknuds1 force-pushed the fix/flaky-async-rule-evaluation-test branch from 5dc296a to e0b6b3e Compare February 15, 2026 15:20
@aknuds1
aknuds1 marked this pull request as ready for review February 15, 2026 15:24
@aknuds1
aknuds1 requested a review from a team as a code owner February 15, 2026 15:24

@krajorama krajorama left a comment

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As far as I understand this is not a stress test or meant to be a fuzzy test, it's testing the logic, so it's ok to make it deterministic per time.

@aknuds1
aknuds1 merged commit 3d2647d into prometheus:main Feb 16, 2026
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@aknuds1
aknuds1 deleted the fix/flaky-async-rule-evaluation-test branch February 16, 2026 09:30
bwplotka added a commit that referenced this pull request Feb 23, 2026
* Isolate fix: Remove 5s sleep for 99% speedup. Discarded unwanted code.

Signed-off-by: 3Juhwan <[email protected]>
Signed-off-by: Sammy Tran <[email protected]>

* Add regex optimization for simple contains alternations

Signed-off-by: Casie Chen <[email protected]>

* enable experimental functions in promql benchmarks

Signed-off-by: Dan Cech <[email protected]>

* Fix a couple of broken links in configuration.md (#18045)

Signed-off-by: kakabisht <[email protected]>

* promql: info function: support multiple name matchers (#17968)

* Add new test cases for multiple name matchers in PromQL info function
* Fix handling of multiple name matchers in PromQL info function

---------

Signed-off-by: Jeanette Tan <[email protected]>

* tsdb: Optimize LabelValues for sparse intersections (Fixes #14551)

Signed-off-by: Divyansh Mishra <[email protected]>

* fix: handle ErrTooOldSample as 400 Bad Request in OTLP and v2 histogram write paths

The OTLP write handler and the PRW v2 histogram append path were missing
ErrTooOldSample from their error type checks, causing these errors to
fall through to the default case and return HTTP 500 Internal Server Error.
This triggered unnecessary retries in OTLP clients like the Python SDK.

The PRW v1 write handler (line 115) and the PRW v2 sample append path
(line 377) already correctly handle ErrTooOldSample as a 400, and this
change makes the remaining paths consistent.

Also adds ErrTooOldSample to the v1 sample/histogram log checks so
these errors are properly logged instead of silently returned.

Fixes #16645

Signed-off-by: Varun Chawla <[email protected]>

* fix: prevent stale exemplars leaking to histogram _sum/_count across data points (#18056)

In addHistogramDataPoints, exemplars assigned to the +Inf bucket of one
data point were carried over into the _sum and _count Append calls of
the next data point via the shared appOpts. Clear appOpts.Exemplars at
the start of each loop iteration to restore the nil-exemplar semantics
that existed before the AppenderV2 migration.

Signed-off-by: Arve Knudsen <[email protected]>

* tsdb: fix flaky TestBlockRanges by using explicit compaction

Replace polling loops (for range 100 { time.Sleep }) with explicit
db.Compact() calls after disabling background compaction, eliminating
CI flakiness on slow machines. Also fix incorrect overlap assertions
that were checking the wrong direction (LessOrEqual -> GreaterOrEqual).

Signed-off-by: Arve Knudsen <[email protected]>

* rules: fix flaky TestAsyncRuleEvaluation on Windows (#17965)

Convert all timing-sensitive subtests of TestAsyncRuleEvaluation to use
synctest for deterministic testing. This fixes flakiness on Windows
caused by timer granularity and scheduling variance.

The timing assertions are preserved using synctest's fake time, which
allows accurate verification of sequential vs concurrent execution
timing without relying on wall-clock time.

Fixes #17961

Signed-off-by: Arve Knudsen <[email protected]>

* Move krajorama to general maintainer (#18095)

He's been participating in the bug scrub for a year and provides
reviews all over the code base. Also fix name spelling.

Signed-off-by: György Krajcsovits <[email protected]>

* promtool: fix --enable-feature flags ignored in check config and test rules (#18097)

Both are regressions from the parser refactoring in #17977.

- Fixes #18092
- Fixes #18093

Signed-off-by: Martin Valiente Ainz <[email protected]>

* tsdb/wlog: Remove any temproary checkpoints when creating a Checkpoint (#17598)

* RemoveTmpDirs function to tsdbutil
* Refactor db to use RemoveTmpDirs and no longer cleanup checkpoint tmp dirs
* Use RemoveTmpDirs in wlog checkpoint to cleanup all checkpoint tmp folders
* Add tests for RemoveTmpDirs
* Ensure db.Open will still cleanup extra temporary checkpoints

Signed-off-by: Kyle Eckhart <[email protected]>

* chore(lint): enable wg.Go

Since our minimum supported go version is now go 1.25, we can use wg.Go.

Signed-off-by: Julien Pivotto <[email protected]>

* chore: enable staticcheck linter and update golangci-lint to 2.10.1

Signed-off-by: Matthieu MOREL <[email protected]>

* PromQL: Add experimental histogram_quantiles variadic function (#17285)

Signed-off-by: Linas Medziunas <[email protected]>
Signed-off-by: Björn Rabenstein <[email protected]>
Signed-off-by: beorn7 <[email protected]>
Co-authored-by: Björn Rabenstein <[email protected]>
Co-authored-by: beorn7 <[email protected]>

* Upgrade `mongo-driver` to v1.17.9 (#18077)

Signed-off-by: Sayuru <[email protected]>

* tests: add CI job for ompliance testing (#18121)

Signed-off-by: bwplotka <[email protected]>

* chore: Add consistent closing logging (#18119)

Signed-off-by: bwplotka <[email protected]>

* fix(deps): update github.com/hashicorp/nomad/api digest to daca79d (#18128)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update aws go dependencies (#18135)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* Fix renovate PR body (#18154)

* chore(deps): update actions/stale action to v10.2.0 (#18144)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* chore(deps): update actions/setup-node action to v6.2.0 (#18143)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* chore(deps): update github/codeql-action action to v4.32.4 (#18147)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update kubernetes go dependencies to v0.35.1 (#18136)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* chore(deps): update dependabot/fetch-metadata action to v2.5.0 (#18145)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update module github.com/prometheus/alertmanager to v0.31.1 (#18142)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update module github.com/klauspost/compress to v1.18.4 (#18138)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update github.com/nsf/jsondiff digest to 8e8d90c (#18129)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update google.golang.org/genproto/googleapis/api digest to 42d3e9b (#18132)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* Fixup renovate PR note (#18156)

* fix(deps): update module golang.org/x/sys to v0.41.0 (#18163)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update module github.com/grpc-ecosystem/grpc-gateway/v2 to v2.28.0 (#18159)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update module github.com/envoyproxy/go-control-plane/envoy to v1.37.0 (#18158)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update module github.com/digitalocean/godo to v1.175.0 (#18157)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update module google.golang.org/api to v0.267.0 (#18165)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* [FEATURE] AWS SD:  Add Elasticache Role (#18099)

* AWS SD: Elasticache

This change adds Elasticache to the AWS SD.

Co-authored-by: Ben Kochie <[email protected]>
Signed-off-by: Matt <[email protected]>

---------

Signed-off-by: Matt <[email protected]>
Co-authored-by: Ben Kochie <[email protected]>

* fix(deps): update module golang.org/x/text to v0.34.0 (#18164)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix(deps): update module github.com/envoyproxy/protoc-gen-validate to v1.3.3 (#18137)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix test after merge

Signed-off-by: bwplotka <[email protected]>

---------

Signed-off-by: 3Juhwan <[email protected]>
Signed-off-by: Sammy Tran <[email protected]>
Signed-off-by: Casie Chen <[email protected]>
Signed-off-by: Dan Cech <[email protected]>
Signed-off-by: kakabisht <[email protected]>
Signed-off-by: Jeanette Tan <[email protected]>
Signed-off-by: Divyansh Mishra <[email protected]>
Signed-off-by: Varun Chawla <[email protected]>
Signed-off-by: Arve Knudsen <[email protected]>
Signed-off-by: György Krajcsovits <[email protected]>
Signed-off-by: Martin Valiente Ainz <[email protected]>
Signed-off-by: Kyle Eckhart <[email protected]>
Signed-off-by: Julien Pivotto <[email protected]>
Signed-off-by: Matthieu MOREL <[email protected]>
Signed-off-by: Linas Medziunas <[email protected]>
Signed-off-by: Björn Rabenstein <[email protected]>
Signed-off-by: beorn7 <[email protected]>
Signed-off-by: Sayuru <[email protected]>
Signed-off-by: bwplotka <[email protected]>
Signed-off-by: Matt <[email protected]>
Co-authored-by: 3Juhwan <[email protected]>
Co-authored-by: Casie Chen <[email protected]>
Co-authored-by: Dan Cech <[email protected]>
Co-authored-by: hridyesh bisht <[email protected]>
Co-authored-by: Julien <[email protected]>
Co-authored-by: zenador <[email protected]>
Co-authored-by: Divyansh Mishra <[email protected]>
Co-authored-by: Varun Chawla <[email protected]>
Co-authored-by: Arve Knudsen <[email protected]>
Co-authored-by: George Krajcsovits <[email protected]>
Co-authored-by: Martin Valiente Ainz <[email protected]>
Co-authored-by: Bryan Boreham <[email protected]>
Co-authored-by: Kyle Eckhart <[email protected]>
Co-authored-by: Matthieu MOREL <[email protected]>
Co-authored-by: Linas Medžiūnas <[email protected]>
Co-authored-by: Björn Rabenstein <[email protected]>
Co-authored-by: beorn7 <[email protected]>
Co-authored-by: Sayuru <[email protected]>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Ben Kochie <[email protected]>
Co-authored-by: Matt <[email protected]>
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test: TestAsyncRuleEvaluation/asynchronous_evaluation_with_independent_and_dependent_rules is flaky

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