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Included review availability: This review used your included allowance. 7 included reviews remain after this review. Your included PR review attempts over the past 7 days set your current allowance at 8 reviews per hour. WalkthroughAdds a CLI tool that compares paired bot and exporter Prometheus snapshots, applies configured comparison rules, and reports findings that persist across multiple pairs. Adds tests and snapshot fixtures for matching, differing, and invalid inputs. Adds the test to CI and documents the CI checks and a live-environment snapshot comparison procedure. Priority: ⬇️ Low Merge Risk: 🔵 Low · up to The comparison tool is ready for normal checks, but the first porting release may not contain the script required by the staging procedure. Clarify how to run that procedure if the releases are separate. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 14.89% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 47 functions across 2 files. (2 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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The title clearly and concisely identifies the main change: adding the liq_* parity comparison tool. |
| Description check | |
The description directly explains the new comparison tool, its behavior, validation rules, testing, operational procedure, and limitations. |
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Docstring coverage is 14.89% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 47 functions across 2 files. (2 skipped: 2 unsupported.)
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Review comments at @scripts/liq-parity/compare.py:
- Around line 161-162: Update format_series to escape label values according to
Prometheus text exposition rules before rendering them, including newlines,
quotes, and backslashes. Preserve the existing label ordering and series format.
- Around line 122-125: Update the line parsing logic near brace and token
detection to strip leading whitespace before identifying blank lines or
comments, and split sample tokens on arbitrary whitespace so tab-separated liq_*
samples are parsed with the correct series name.
- Line 169: Update the absolute-tolerance comparison so NaN values are
explicitly treated as mismatches before applying the tolerance check. Preserve
the existing tolerance behavior for numeric values; locate the comparison at the
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Adds scripts/liq-parity/compare.py, an operator tool that diffs the bot's liq_* metrics against the exporter sidecar's over several snapshot pairs and reports only findings present in every pair. It also adds a unit test that CI and nix run .#ci run, and an IAP SSH procedure in docs/observability.md. The tool is read-only and is not deployed, and the 8 tests pass locally.
Overall it is sound and does what it says. The weak spot is false passes: in four places a real disagreement on a ported name can still end in exit 0. The cases are a disagreement that changes kind between pairs, the ignore entries in KNOWN_DIFFS, duplicate series, and stale snapshot files left by a failed capture. None of these block the merge, but each one weakens the claim that exit 0 means parity, and later port PRs will rely on that claim.
One design point for the stack, not a finding: both jobs are already scraped into the same Managed Prometheus store. A PromQL comparison of the two jobs over a window may become the simpler cutover gate before more names are ported.
claude-opus-5-5 · high · 8 min
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @scripts/liq-parity/compare.py:
- Around line 138-141: Update `_parse_labels` to skip whitespace after each
comma before locating the next label key, so labels with and without spacing
produce the same series key. Add or update tests to verify both spellings parse
as one series.
- Line 270: Update the snapshot-reading open(path) call to specify UTF-8
encoding so non-ASCII Prometheus text is decoded consistently across machines.
- Line 130: Update parse_exposition to validate the complete sample line:
require a value and allow only an optional integer timestamp after it. Reject
extra tokens or invalid timestamps so malformed samples make unusable_snapshots
return exit 2.
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Adds scripts/liq-parity/compare.py, a read-only operator tool that compares the bot's liq_* series with the exporter sidecar's over several snapshot pairs and reports only series that disagree in every pair, plus its tests in CI and an IAP SSH procedure in docs/observability.md. The code is small, well tested (13 tests pass), and all earlier threads are fixed. Nothing blocks the merge. The notes below are about the tool reporting a clean result when it should not: a degraded exporter body in one pair can hide real findings, two consumed board names sit in the drop list, and the exit-status guide overlaps with SSH and Python failures. One claim that the procedure leaks infrastructure layout into this public repo was checked and dismissed: the VM, zone, IAP commands and port 8001 were already public, and 9101 is loopback-only.
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Adds scripts/liq-parity/compare.py, a read-only operator tool that compares the bot's liq_* /metrics output with the exporter sidecar's over several snapshot pairs, plus its CI-run tests and the operator procedure in docs/observability.md. It reports only differences that persist in every pair, checks # TYPE per name (bot gauge against exporter untyped is the accepted difference, matching ADR 0026 in #1665), and exits 2 on any snapshot it cannot trust.
Overall read: the tool does what the description says. The 33 tests pass, PORTED and BOT_ONLY match what #1665 renders, the exporter goldens from #1665 parse under the strict grammar, and the earlier review rounds' fixes all hold. No path to a false exit 0 was found beyond the three gaps already deferred in the description. A concern that the runbook now names the exporter's localhost port in a public repo was checked and dismissed: the zone, IAP access, the exporter sidecar and the bot's port 8001 were already public, and the new port is reachable only behind IAP SSH. Three small comments below: the grammar is looser than Prometheus on Unicode whitespace, an untyped bot name passes the type check, and the ignore rule has no users.
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scripts/liq-parity/compare.py compares the bot's liq_* series with the exporter sidecar's, from snapshot pairs taken on a live environment. Only findings present in every pair are reported, matched by kind and series so a mismatch whose values move still counts. Names not ported yet are listed, not reported, and --drop-list / --known-diffs apply the documented exceptions. It exits 2 on a snapshot that is not Prometheus text or has no liq_* series. CI runs its tests next to the board check, and docs/observability.md describes the operator procedure over IAP SSH.
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JuaniRios
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Part of RAI-3084.
Adds
scripts/liq-parity/compare.py, the tool that checks the bot'sliq_*output against the exporter sidecar's on a live environment. Part of the RAI-2998 stack.Live effect: none (an operator script and its CI test) · Risk: low (read-only tool, not deployed) · Ships: on merge, as a script in the repo
Why
Each PR that ports more
liq_*names into the bot needs proof that the bot publishes exactly what the exporter does before consumers move over (RAI-2999). This is that check.Decisions
--drop-listskips names nobody reads,--known-diffsapplies the documented exceptions.1_0), a comma with no label before it, a repeated series or label name, a missing final line feed, or a body that isn't UTF-8 makes the snapshot unusable: exit2, not a pass. Same for a snapshot with no portedliq_*series (empty body, error page, degraded target).# TYPEper name too. The bot publishes everyliq_*name as a typed gauge (ADR 0026 in feat: publish the liq_* foundation families from the bot [RAI-3085] #1665), and the exporter is untyped. So with--known-diffs, botgaugeagainst exporter untyped is the expected difference for every name. Any other type mismatch (for example a botcounter) is a finding. A malformed TYPE line, a repeated one, or one after its samples makes the snapshot unusable.2by reason: no ported series means rerun; a parse or repeat error in a bot snapshot is a port bug.docs/observability.mdhas the operator procedure: three pairs over IAP SSH from a local checkout, stops on a failed scrape.Proof
python3 scripts/liq-parity/test_compare.py: 33 passed (series matching across pairs, type comparison, unusable snapshots, the parser grammar, escaped labels). CI runs it.not_portedis per pair, and two pre-registeredKNOWN_DIFFSentries should move to the PR that ports them.