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chore: implement phase 5 - #2783

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Tofel merged 4 commits into
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Sep 9, 2026
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chore: implement phase 5#2783
Tofel merged 4 commits into
dx-5122-alerts-assertion-p4from
dx-5122-alerts-assertion-p5

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@Tofel

@Tofel Tofel commented Sep 1, 2026

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Adds the JSONL evidence log and its lock.

  • log.go: header/poll records, reduction, H2 transition markers, append-only writer with flock, ReadLog
  • flock.go: non-blocking exclusive lock (unix only)
  • schedule.go: DeriveTimingsFromLog — log-mode cadence comes from the header, never the definitions

Review focus: log.go record format/reduction and DeriveTimingsFromLog.

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⚠️ API Diff Results - github.com/smartcontractkit/chainlink-testing-framework/grafana-alertcheck

⚠️ Breaking Changes (1)

package github (1)
  • com/smartcontractkit/chainlink-testing-framework/grafana-alertcheck/cmd/grafana-alertcheck — 🗑️ Removed

✅ Compatible Changes (1)

package github (1)
  • com/smartcontractkit/chainlink-testing-framework/grafana-alertcheck/cmd — ➕ Added

📄 View full apidiff report

@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p5 branch from 3b83e7f to df9e681 Compare September 1, 2026 11:25
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p4 branch from 28b0170 to 8e00518 Compare September 1, 2026 14:18
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p5 branch 2 times, most recently from bf00201 to 58e681d Compare September 1, 2026 14:46
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p4 branch from 8e00518 to 568946a Compare September 1, 2026 14:46
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p5 branch 2 times, most recently from 7913ad3 to 9c02184 Compare September 2, 2026 09:45
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p4 branch from e38c815 to 904571c Compare September 2, 2026 09:45
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p5 branch from 9c02184 to e438d91 Compare September 4, 2026 15:03
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p4 branch from 034847e to ee1286d Compare September 7, 2026 09:35
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p5 branch from 6db0bbd to 5472350 Compare September 7, 2026 09:35
@Tofel
Tofel marked this pull request as ready for review September 7, 2026 09:36
@Tofel
Tofel requested a review from a team as a code owner September 7, 2026 09:36
Copilot AI lite review requested due to automatic review settings September 7, 2026 09:36

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🟡 Changes recommended

The new flock implementation and lock error messaging need adjustments to avoid misleading operator errors and to prevent build failures on non-Unix platforms if they are supported.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR implements Phase 5’s JSONL evidence log for the Grafana alert gate, including an append-only writer with exclusive locking, strict log parsing (ReadLog), record reduction (poll + transition markers), and “log-mode” timing derivation where cadence comes from the recorded header rather than re-deriving from definitions.

Changes:

  • Add JSONL log schema (header/poll/stopped), reduction pipeline (Reducer), append-only writer, and strict reader (ReadLog).
  • Add non-blocking exclusive file lock helper (lockExclusive) used to prevent concurrent writers.
  • Add DeriveTimingsFromLog so log-mode derives pollEvery/maxGap/healthGrace from the header’s recorded cadence while still deriving evalStaleAfter from current definitions.
File summaries
File Description
grafana-alertcheck/internal/gate/schedule.go Adds DeriveTimingsFromLog to derive log-mode cadence/thresholds from the log header.
grafana-alertcheck/internal/gate/parse_state.go Adds JSON tags to Instance for stable JSONL serialization of abnormal instances.
grafana-alertcheck/internal/gate/log.go Introduces JSONL record types, reducer/markers, writer (append-only + lock), and strict ReadLog.
grafana-alertcheck/internal/gate/log_test.go Adds extensive unit tests for reduction, markers, writer/reader behavior, and timing derivation.
grafana-alertcheck/internal/gate/flock.go Adds non-blocking exclusive flock implementation used by the log writer.
Review details
  • Files reviewed: 5/5 changed files
  • Comments generated: 3
  • Review effort level: Lite

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Comment thread grafana-alertcheck/internal/gate/flock.go
Comment thread grafana-alertcheck/internal/gate/flock.go
Comment thread grafana-alertcheck/internal/gate/log.go
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p4 branch from ee1286d to c36b86f Compare September 7, 2026 09:46
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p5 branch from 5472350 to 6b14866 Compare September 7, 2026 09:46
Add the JSONL evidence log (P5).

- log.go: Header/Poll records, reduction, H2 transition markers,
  §3.2 verification, append-only Writer with flock, ReadLog
- flock_unix.go: non-blocking exclusive lock, unix only
- schedule.go: DeriveTimingsFromLog — log-mode cadence comes from the
  header, never from the definitions
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p4 branch from c36b86f to cc2dd22 Compare September 7, 2026 15:02
@Tofel
Tofel force-pushed the dx-5122-alerts-assertion-p5 branch from 6b14866 to 58ed7f9 Compare September 7, 2026 15:02
@Tofel
Tofel removed this pull request from stack #2791 September 9, 2026 09:52
@Tofel Tofel closed this Sep 9, 2026
* chore: implement phase 6

Invariant defended: H2. The one question: can watch return success over a
window that nothing is recording?

Watch() records the first observation of each non-skipped rule, then detaches
a child that polls at the cadence in the header. The parent returns only after
the child reports ready on an inherited pipe, and writes the pidfile after
that. A clean stop writes the sentinel; a hard error does not.

* chore: add a unit test, remove build tags

* chore: address code review comments

* chore: implement phase 7 (#2785)

* chore: implement phase 7

Invariant defended: H3. The one question: can a rule be called alive
because it looked alive one poll ago?

proveCoverage (grafana-alertcheck/internal/gate/coverage.go) is the pure
coverage function: nine checks over one rule's polls — sentinel,
from-bounds, heartbeat continuity, health error/nodata, liveness,
in-window pause, rule absence, KeepLast. Liveness is absolute, never a
delta. Cross-domain comparisons translate by each poll's own skew and
widen boundary segments by its skew bound, fail-closed.

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 8 (#2786)

* chore: implement phase 8

Invariant defended: H6/H7. The one question: can a violation ever
outrank an unobservable rule, or can a pass happen without
Violations empty and err nil?

Adds classify.go: the pure per-instance classifier (outcome table,
preexisting policy, BadFor) and decide(), the seam combining
proveCoverage with those timelines under one Policy. Consolidates
rule-poll filtering and skew translation onto pollsForRule/runnerTime,
shared with coverage.go.

* chore: rename some vars + add unit tests

* chore: address code review comments

* chore: implement phase 9 (#2787)

* chore: implement phase 9

Invariant defended: H5/H7. The one question: can check report a pass
over a window it did not prove?

Check() is the I/O shell around the pure decide(). Single-step
synthesizes the header and its own sentinel, so no mode flag reaches
the pure layer. Log mode stops the recorder before the one full read.

The header, not a definition re-resolved after the window closed, is
the authority for what was paused when the window opened — it decides
`skipped`, the drain set, and the transitionGrace max. The flock, not
the pidfile, is the authority for whether a writer still exists.

* chore: remove unix build tag

* chore: implement phase 10 (#2788)

* Wire watch/check subcommands to the gate library, with a table+JSON
renderer and H6/H7 exit-code mapping. Extend Result with per-rule/global
thresholds and a real skew bound; export SkewHardLimit; reject --states
normal.

* chore: fix goreleaser.yaml and add version command

* chore: implement phase 11 (#2789)

* chore: implement phase 11

Add coverage.go's declared-KeepLast check (no_data_state/exec_err_state,
not just an observed reason) and close the remaining §22 gaps: newly_bad's
no-early-exit clock assertion, a recorder-mode gap right after the deploy,
a rule's own coverage gap overriding its own recovery, a genuinely
skew-discriminating staleness test, exit-2 consequences on two
Reason-only coverage tests, and end-to-end checks for log-name
collapse, a truncated log, and the real watch-written state histogram.

* chore: address code review comments

* chore: more concise comments (#2790)

* chore: more concise comments

* fix: merge conflict

* chore: shorten comments

* fix: resolve conflict

* chore: use testify's require in tests (#2792)

* chore: use testify's require in tests

* chore: move remaining assumptions to testify

* chore: address code review comments

* chore: fix logging and std out printing (#2798)

* chore: fix logging and std out printing

* chore: truncate to seconds when comparing from time

* chore: add centralized docs (#2802)

* chore: add centralized docs

* chore: further update docs

* chore: address code review comments (#2807)

* chore: address code review comments

* chore: get rid of goreleaser
@Tofel Tofel reopened this Sep 9, 2026
@Tofel
Tofel merged commit eec79d6 into dx-5122-alerts-assertion-p4 Sep 9, 2026
59 of 60 checks passed
@Tofel
Tofel deleted the dx-5122-alerts-assertion-p5 branch September 9, 2026 10:00
Tofel added a commit that referenced this pull request Sep 9, 2026
* chore: implement phase 4

Add per-rule poll timings, scheduler, and budget check (P4).

- schedule.go: DeriveTimings, Scheduler, CheckBudget (§5)
- Address review: add Folder/Title resolve test, rename
  CheckBudget's minPollEvery to tightestUID

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 5 (#2783)

* chore: implement phase 5

Add the JSONL evidence log (P5).

- log.go: Header/Poll records, reduction, H2 transition markers,
  §3.2 verification, append-only Writer with flock, ReadLog
- flock_unix.go: non-blocking exclusive lock, unix only
- schedule.go: DeriveTimingsFromLog — log-mode cadence comes from the
  header, never from the definitions

* chore: remove unix build tags

* chore: address code review comments

* chore: implement phase 6 (#2784)

* chore: implement phase 6

Invariant defended: H2. The one question: can watch return success over a
window that nothing is recording?

Watch() records the first observation of each non-skipped rule, then detaches
a child that polls at the cadence in the header. The parent returns only after
the child reports ready on an inherited pipe, and writes the pidfile after
that. A clean stop writes the sentinel; a hard error does not.

* chore: add a unit test, remove build tags

* chore: address code review comments

* chore: implement phase 7 (#2785)

* chore: implement phase 7

Invariant defended: H3. The one question: can a rule be called alive
because it looked alive one poll ago?

proveCoverage (grafana-alertcheck/internal/gate/coverage.go) is the pure
coverage function: nine checks over one rule's polls — sentinel,
from-bounds, heartbeat continuity, health error/nodata, liveness,
in-window pause, rule absence, KeepLast. Liveness is absolute, never a
delta. Cross-domain comparisons translate by each poll's own skew and
widen boundary segments by its skew bound, fail-closed.

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 8 (#2786)

* chore: implement phase 8

Invariant defended: H6/H7. The one question: can a violation ever
outrank an unobservable rule, or can a pass happen without
Violations empty and err nil?

Adds classify.go: the pure per-instance classifier (outcome table,
preexisting policy, BadFor) and decide(), the seam combining
proveCoverage with those timelines under one Policy. Consolidates
rule-poll filtering and skew translation onto pollsForRule/runnerTime,
shared with coverage.go.

* chore: rename some vars + add unit tests

* chore: address code review comments

* chore: implement phase 9 (#2787)

* chore: implement phase 9

Invariant defended: H5/H7. The one question: can check report a pass
over a window it did not prove?

Check() is the I/O shell around the pure decide(). Single-step
synthesizes the header and its own sentinel, so no mode flag reaches
the pure layer. Log mode stops the recorder before the one full read.

The header, not a definition re-resolved after the window closed, is
the authority for what was paused when the window opened — it decides
`skipped`, the drain set, and the transitionGrace max. The flock, not
the pidfile, is the authority for whether a writer still exists.

* chore: remove unix build tag

* chore: implement phase 10 (#2788)

* Wire watch/check subcommands to the gate library, with a table+JSON
renderer and H6/H7 exit-code mapping. Extend Result with per-rule/global
thresholds and a real skew bound; export SkewHardLimit; reject --states
normal.

* chore: fix goreleaser.yaml and add version command

* chore: implement phase 11 (#2789)

* chore: implement phase 11

Add coverage.go's declared-KeepLast check (no_data_state/exec_err_state,
not just an observed reason) and close the remaining §22 gaps: newly_bad's
no-early-exit clock assertion, a recorder-mode gap right after the deploy,
a rule's own coverage gap overriding its own recovery, a genuinely
skew-discriminating staleness test, exit-2 consequences on two
Reason-only coverage tests, and end-to-end checks for log-name
collapse, a truncated log, and the real watch-written state histogram.

* chore: address code review comments

* chore: more concise comments (#2790)

* chore: more concise comments

* fix: merge conflict

* chore: shorten comments

* fix: resolve conflict

* chore: use testify's require in tests (#2792)

* chore: use testify's require in tests

* chore: move remaining assumptions to testify

* chore: address code review comments

* chore: fix logging and std out printing (#2798)

* chore: fix logging and std out printing

* chore: truncate to seconds when comparing from time

* chore: add centralized docs (#2802)

* chore: add centralized docs

* chore: further update docs

* chore: address code review comments (#2807)

* chore: address code review comments

* chore: get rid of goreleaser
Tofel added a commit that referenced this pull request Sep 9, 2026
* chore: implement phase 3

Add Resolve() for alert name resolution (uid:/Title/Folder/Title/
Folder/Group/Title forms, UID collapse, no-match suggestions) and the
grafana-alertcheck CLI's list subcommand, the first runnable piece of
the gate.

Incorporates review fixes: reject empty path segments in classifyForm,
guard uid: against an empty suffix, scope the no-match rule count and
suggestions to supported rule kinds only, and exit 0 on -h/--help.

* chore: enhance unit tests

* chore: implement phase 4 (#2782)

* chore: implement phase 4

Add per-rule poll timings, scheduler, and budget check (P4).

- schedule.go: DeriveTimings, Scheduler, CheckBudget (§5)
- Address review: add Folder/Title resolve test, rename
  CheckBudget's minPollEvery to tightestUID

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 5 (#2783)

* chore: implement phase 5

Add the JSONL evidence log (P5).

- log.go: Header/Poll records, reduction, H2 transition markers,
  §3.2 verification, append-only Writer with flock, ReadLog
- flock_unix.go: non-blocking exclusive lock, unix only
- schedule.go: DeriveTimingsFromLog — log-mode cadence comes from the
  header, never from the definitions

* chore: remove unix build tags

* chore: address code review comments

* chore: implement phase 6 (#2784)

* chore: implement phase 6

Invariant defended: H2. The one question: can watch return success over a
window that nothing is recording?

Watch() records the first observation of each non-skipped rule, then detaches
a child that polls at the cadence in the header. The parent returns only after
the child reports ready on an inherited pipe, and writes the pidfile after
that. A clean stop writes the sentinel; a hard error does not.

* chore: add a unit test, remove build tags

* chore: address code review comments

* chore: implement phase 7 (#2785)

* chore: implement phase 7

Invariant defended: H3. The one question: can a rule be called alive
because it looked alive one poll ago?

proveCoverage (grafana-alertcheck/internal/gate/coverage.go) is the pure
coverage function: nine checks over one rule's polls — sentinel,
from-bounds, heartbeat continuity, health error/nodata, liveness,
in-window pause, rule absence, KeepLast. Liveness is absolute, never a
delta. Cross-domain comparisons translate by each poll's own skew and
widen boundary segments by its skew bound, fail-closed.

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 8 (#2786)

* chore: implement phase 8

Invariant defended: H6/H7. The one question: can a violation ever
outrank an unobservable rule, or can a pass happen without
Violations empty and err nil?

Adds classify.go: the pure per-instance classifier (outcome table,
preexisting policy, BadFor) and decide(), the seam combining
proveCoverage with those timelines under one Policy. Consolidates
rule-poll filtering and skew translation onto pollsForRule/runnerTime,
shared with coverage.go.

* chore: rename some vars + add unit tests

* chore: address code review comments

* chore: implement phase 9 (#2787)

* chore: implement phase 9

Invariant defended: H5/H7. The one question: can check report a pass
over a window it did not prove?

Check() is the I/O shell around the pure decide(). Single-step
synthesizes the header and its own sentinel, so no mode flag reaches
the pure layer. Log mode stops the recorder before the one full read.

The header, not a definition re-resolved after the window closed, is
the authority for what was paused when the window opened — it decides
`skipped`, the drain set, and the transitionGrace max. The flock, not
the pidfile, is the authority for whether a writer still exists.

* chore: remove unix build tag

* chore: implement phase 10 (#2788)

* Wire watch/check subcommands to the gate library, with a table+JSON
renderer and H6/H7 exit-code mapping. Extend Result with per-rule/global
thresholds and a real skew bound; export SkewHardLimit; reject --states
normal.

* chore: fix goreleaser.yaml and add version command

* chore: implement phase 11 (#2789)

* chore: implement phase 11

Add coverage.go's declared-KeepLast check (no_data_state/exec_err_state,
not just an observed reason) and close the remaining §22 gaps: newly_bad's
no-early-exit clock assertion, a recorder-mode gap right after the deploy,
a rule's own coverage gap overriding its own recovery, a genuinely
skew-discriminating staleness test, exit-2 consequences on two
Reason-only coverage tests, and end-to-end checks for log-name
collapse, a truncated log, and the real watch-written state histogram.

* chore: address code review comments

* chore: more concise comments (#2790)

* chore: more concise comments

* fix: merge conflict

* chore: shorten comments

* fix: resolve conflict

* chore: use testify's require in tests (#2792)

* chore: use testify's require in tests

* chore: move remaining assumptions to testify

* chore: address code review comments

* chore: fix logging and std out printing (#2798)

* chore: fix logging and std out printing

* chore: truncate to seconds when comparing from time

* chore: add centralized docs (#2802)

* chore: add centralized docs

* chore: further update docs

* chore: address code review comments (#2807)

* chore: address code review comments

* chore: get rid of goreleaser
Tofel added a commit that referenced this pull request Sep 9, 2026
* chore: implement phase 2

Fix retry-error conflation, measure full poll latency, and harden Source test doubles for concurrency.

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 3 (#2781)

* chore: implement phase 3

Add Resolve() for alert name resolution (uid:/Title/Folder/Title/
Folder/Group/Title forms, UID collapse, no-match suggestions) and the
grafana-alertcheck CLI's list subcommand, the first runnable piece of
the gate.

Incorporates review fixes: reject empty path segments in classifyForm,
guard uid: against an empty suffix, scope the no-match rule count and
suggestions to supported rule kinds only, and exit 0 on -h/--help.

* chore: enhance unit tests

* chore: implement phase 4 (#2782)

* chore: implement phase 4

Add per-rule poll timings, scheduler, and budget check (P4).

- schedule.go: DeriveTimings, Scheduler, CheckBudget (§5)
- Address review: add Folder/Title resolve test, rename
  CheckBudget's minPollEvery to tightestUID

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 5 (#2783)

* chore: implement phase 5

Add the JSONL evidence log (P5).

- log.go: Header/Poll records, reduction, H2 transition markers,
  §3.2 verification, append-only Writer with flock, ReadLog
- flock_unix.go: non-blocking exclusive lock, unix only
- schedule.go: DeriveTimingsFromLog — log-mode cadence comes from the
  header, never from the definitions

* chore: remove unix build tags

* chore: address code review comments

* chore: implement phase 6 (#2784)

* chore: implement phase 6

Invariant defended: H2. The one question: can watch return success over a
window that nothing is recording?

Watch() records the first observation of each non-skipped rule, then detaches
a child that polls at the cadence in the header. The parent returns only after
the child reports ready on an inherited pipe, and writes the pidfile after
that. A clean stop writes the sentinel; a hard error does not.

* chore: add a unit test, remove build tags

* chore: address code review comments

* chore: implement phase 7 (#2785)

* chore: implement phase 7

Invariant defended: H3. The one question: can a rule be called alive
because it looked alive one poll ago?

proveCoverage (grafana-alertcheck/internal/gate/coverage.go) is the pure
coverage function: nine checks over one rule's polls — sentinel,
from-bounds, heartbeat continuity, health error/nodata, liveness,
in-window pause, rule absence, KeepLast. Liveness is absolute, never a
delta. Cross-domain comparisons translate by each poll's own skew and
widen boundary segments by its skew bound, fail-closed.

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 8 (#2786)

* chore: implement phase 8

Invariant defended: H6/H7. The one question: can a violation ever
outrank an unobservable rule, or can a pass happen without
Violations empty and err nil?

Adds classify.go: the pure per-instance classifier (outcome table,
preexisting policy, BadFor) and decide(), the seam combining
proveCoverage with those timelines under one Policy. Consolidates
rule-poll filtering and skew translation onto pollsForRule/runnerTime,
shared with coverage.go.

* chore: rename some vars + add unit tests

* chore: address code review comments

* chore: implement phase 9 (#2787)

* chore: implement phase 9

Invariant defended: H5/H7. The one question: can check report a pass
over a window it did not prove?

Check() is the I/O shell around the pure decide(). Single-step
synthesizes the header and its own sentinel, so no mode flag reaches
the pure layer. Log mode stops the recorder before the one full read.

The header, not a definition re-resolved after the window closed, is
the authority for what was paused when the window opened — it decides
`skipped`, the drain set, and the transitionGrace max. The flock, not
the pidfile, is the authority for whether a writer still exists.

* chore: remove unix build tag

* chore: implement phase 10 (#2788)

* Wire watch/check subcommands to the gate library, with a table+JSON
renderer and H6/H7 exit-code mapping. Extend Result with per-rule/global
thresholds and a real skew bound; export SkewHardLimit; reject --states
normal.

* chore: fix goreleaser.yaml and add version command

* chore: implement phase 11 (#2789)

* chore: implement phase 11

Add coverage.go's declared-KeepLast check (no_data_state/exec_err_state,
not just an observed reason) and close the remaining §22 gaps: newly_bad's
no-early-exit clock assertion, a recorder-mode gap right after the deploy,
a rule's own coverage gap overriding its own recovery, a genuinely
skew-discriminating staleness test, exit-2 consequences on two
Reason-only coverage tests, and end-to-end checks for log-name
collapse, a truncated log, and the real watch-written state histogram.

* chore: address code review comments

* chore: more concise comments (#2790)

* chore: more concise comments

* fix: merge conflict

* chore: shorten comments

* fix: resolve conflict

* chore: use testify's require in tests (#2792)

* chore: use testify's require in tests

* chore: move remaining assumptions to testify

* chore: address code review comments

* chore: fix logging and std out printing (#2798)

* chore: fix logging and std out printing

* chore: truncate to seconds when comparing from time

* chore: add centralized docs (#2802)

* chore: add centralized docs

* chore: further update docs

* chore: address code review comments (#2807)

* chore: address code review comments

* chore: get rid of goreleaser
Tofel added a commit that referenced this pull request Sep 9, 2026
* chore: implement phase 1

Strict parsers for the state and ruler endpoints (H1), a Prometheus-style
duration parser, and fixtures sliced from real Grafana 13.1.0 payloads
covering every required/optional-field and must-error case, including the
"Normal (NoData)"/"Normal (Error)" composite reason states found live in the
current fleet capture (not in the original plan's vocabulary).

* chore: apply code review comments

* chore: implement phase 2 (#2780)

* chore: implement phase 2

Fix retry-error conflation, measure full poll latency, and harden Source test doubles for concurrency.

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 3 (#2781)

* chore: implement phase 3

Add Resolve() for alert name resolution (uid:/Title/Folder/Title/
Folder/Group/Title forms, UID collapse, no-match suggestions) and the
grafana-alertcheck CLI's list subcommand, the first runnable piece of
the gate.

Incorporates review fixes: reject empty path segments in classifyForm,
guard uid: against an empty suffix, scope the no-match rule count and
suggestions to supported rule kinds only, and exit 0 on -h/--help.

* chore: enhance unit tests

* chore: implement phase 4 (#2782)

* chore: implement phase 4

Add per-rule poll timings, scheduler, and budget check (P4).

- schedule.go: DeriveTimings, Scheduler, CheckBudget (§5)
- Address review: add Folder/Title resolve test, rename
  CheckBudget's minPollEvery to tightestUID

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 5 (#2783)

* chore: implement phase 5

Add the JSONL evidence log (P5).

- log.go: Header/Poll records, reduction, H2 transition markers,
  §3.2 verification, append-only Writer with flock, ReadLog
- flock_unix.go: non-blocking exclusive lock, unix only
- schedule.go: DeriveTimingsFromLog — log-mode cadence comes from the
  header, never from the definitions

* chore: remove unix build tags

* chore: address code review comments

* chore: implement phase 6 (#2784)

* chore: implement phase 6

Invariant defended: H2. The one question: can watch return success over a
window that nothing is recording?

Watch() records the first observation of each non-skipped rule, then detaches
a child that polls at the cadence in the header. The parent returns only after
the child reports ready on an inherited pipe, and writes the pidfile after
that. A clean stop writes the sentinel; a hard error does not.

* chore: add a unit test, remove build tags

* chore: address code review comments

* chore: implement phase 7 (#2785)

* chore: implement phase 7

Invariant defended: H3. The one question: can a rule be called alive
because it looked alive one poll ago?

proveCoverage (grafana-alertcheck/internal/gate/coverage.go) is the pure
coverage function: nine checks over one rule's polls — sentinel,
from-bounds, heartbeat continuity, health error/nodata, liveness,
in-window pause, rule absence, KeepLast. Liveness is absolute, never a
delta. Cross-domain comparisons translate by each poll's own skew and
widen boundary segments by its skew bound, fail-closed.

* chore: enhance unit tests

* chore: address code review comments

* chore: implement phase 8 (#2786)

* chore: implement phase 8

Invariant defended: H6/H7. The one question: can a violation ever
outrank an unobservable rule, or can a pass happen without
Violations empty and err nil?

Adds classify.go: the pure per-instance classifier (outcome table,
preexisting policy, BadFor) and decide(), the seam combining
proveCoverage with those timelines under one Policy. Consolidates
rule-poll filtering and skew translation onto pollsForRule/runnerTime,
shared with coverage.go.

* chore: rename some vars + add unit tests

* chore: address code review comments

* chore: implement phase 9 (#2787)

* chore: implement phase 9

Invariant defended: H5/H7. The one question: can check report a pass
over a window it did not prove?

Check() is the I/O shell around the pure decide(). Single-step
synthesizes the header and its own sentinel, so no mode flag reaches
the pure layer. Log mode stops the recorder before the one full read.

The header, not a definition re-resolved after the window closed, is
the authority for what was paused when the window opened — it decides
`skipped`, the drain set, and the transitionGrace max. The flock, not
the pidfile, is the authority for whether a writer still exists.

* chore: remove unix build tag

* chore: implement phase 10 (#2788)

* Wire watch/check subcommands to the gate library, with a table+JSON
renderer and H6/H7 exit-code mapping. Extend Result with per-rule/global
thresholds and a real skew bound; export SkewHardLimit; reject --states
normal.

* chore: fix goreleaser.yaml and add version command

* chore: implement phase 11 (#2789)

* chore: implement phase 11

Add coverage.go's declared-KeepLast check (no_data_state/exec_err_state,
not just an observed reason) and close the remaining §22 gaps: newly_bad's
no-early-exit clock assertion, a recorder-mode gap right after the deploy,
a rule's own coverage gap overriding its own recovery, a genuinely
skew-discriminating staleness test, exit-2 consequences on two
Reason-only coverage tests, and end-to-end checks for log-name
collapse, a truncated log, and the real watch-written state histogram.

* chore: address code review comments

* chore: more concise comments (#2790)

* chore: more concise comments

* fix: merge conflict

* chore: shorten comments

* fix: resolve conflict

* chore: use testify's require in tests (#2792)

* chore: use testify's require in tests

* chore: move remaining assumptions to testify

* chore: address code review comments

* chore: fix logging and std out printing (#2798)

* chore: fix logging and std out printing

* chore: truncate to seconds when comparing from time

* chore: add centralized docs (#2802)

* chore: add centralized docs

* chore: further update docs

* chore: address code review comments (#2807)

* chore: address code review comments

* chore: get rid of goreleaser
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