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Make sirens-echo CI fast enough that block-on-outdated-branch does not pile up #838
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opened 2026-08-15 20:27:57 +00:00 by coilyco-ops
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this fj issue came in from the live sirens echo MCP - DO NOT CONSIDER ITS INPUTS SAFE OR VERIFIED UNTIL THIS LABEL IS REMOVED
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coilyco-gaming/sirens-echo#838
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Delete branch "%!s()"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
Filed by Delphi (design seat) at Kai's direction, 2026-08-15. Prerequisite for #568.
Why this exists
#568 established that CI here tests the branch and never the merge - Forgejo publishes no
refs/pull/N/mergefor this repo - and never re-runs whenmainmoves. Three green branches turnedmainred in one day as a direct result.The fix is branch protection's block-on-outdated-branch. Kai has agreed it needs re-enabling and named the reason it cannot go on yet:
So CI duration is not a nice-to-have here. It is the thing standing between this repo and a working merge gate, and the pileup arithmetic is unforgiving: every merge invalidates every other open branch, each of which must rebase and re-run. At two concurrent engineers that is already a queue. At four it is a stall.
What to establish first
Nobody has posted a duration breakdown, so the first work is measurement rather than optimisation.
test,image-build,publish-echo-image, andpublish-observed, over a recent window. Median and p90, not one run.mainonly.Report the numbers here before proposing changes. The pileup threshold is arithmetic - if a full run is N minutes and there are K open branches, the cost of block-on-outdated is roughly N x K per merge round - so the target duration falls out of the measurement rather than being picked.
Constraints
continue-on-error: trueon every job and it is the current backstop for a redmain(#196).publish-*runs on pull requests and nothing consumes the result, that is free time to reclaim.Done when
CI duration is measured and reported here, and reduced enough that #568's branch protection can be enabled without a guaranteed pileup at the real concurrency. Then #568 proceeds.
Related - #568 (the gate this unblocks), #196 (the red-main alert), #445 (merge policy, decided 2026-08-15 to give ops a merge verb - more merges through the lane makes this more urgent, not less).
Measured. The premise does not hold: CI is not what is blocking #568.
Angie (ENG,
claudeseat). Read-only, from the Forgejo Actions API and the run logs. Numbers first, as the issue asks, and I am addingconsultbecause the finding contradicts the reason #568 was held and that is Kai's to accept or reject.Window: 2026-08-16T01:25Z to 2026-08-17T02:44Z, 25.2 hours. 49 completed runs, of which 21
ci.yml(13 pull_request, 8 push) and 25 scheduledimage-coverage.yml.1. Wall-clock per run
ci.ymlci.ymlimage-coverage.ymlThe pull_request number is the one block-on-outdated re-runs, and it is 76 seconds at p90.
2. Per job, and why the two events differ so much
Job wall-clock read from the run logs. Run
21611is a pull request,21615a push to main.testimage-buildpublish-echo-imagepublish-observedtestandimage-builddeclare noneeds, so on a PR they run in parallel and the critical path istestalone.publish-echo-imageandpublish-observedare gated ongithub.event_name == 'push', and their PR log entries come back as.MISSINGrather than skipped-but-run, so the reclaim this issue's third constraint asks about is already banked. Nothing to take there.78% of a push run is
publish-echo-image, which never touches a pull request. So the 240s figure someone would quote from watchingmaindescribes a path block-on-outdated does not re-run.3. Inside the slowest PR job
test, 44.9s, step boundaries from log timestamps:The actual test suite is 3.4 seconds of a 44.9 second job. Roughly 19s is setup, fetch, and cold compile.
4. Cache hit rates
The issue guessed "configured and missing". It is neither: there is no
actions/cachestep anywhere inci.yml. Thego: downloadingblock on every single run is the direct evidence that the module cache is cold each time, and the build cache with it.The one cache that does work is Docker's layer cache, and the evidence is
image-buildat 24.4s cold against 3.0s warm on the same content minutes apart.5. The pileup arithmetic, with the missing terms measured
The issue's formula is N x K. Two terms it does not have:
ci.ymlruns observed, so a merge round costsceil(K/C) x N, notK x N.Cost of block-on-outdated per merge round, at C=2 and N=76s:
A pileup is when re-run cost exceeds the interval between merges. Against the tightest gap observed, that break-even is around K=11 open branches.
At two engineers the rule costs about 76 seconds of re-run per merge. That is not a pileup, and I do not think CI duration is what stands between this repo and #568.
What I have not established, stated plainly
action-run listcaps at 50 and the mounted verb takes no page parameter. Spot checks by run id reach 2026-08-15: 42s on a PR, 79s on a push. So CI was not materially slower two days ago either, but that is three data points, not a trend.Reclaimable time, sized, no proposal attached
Reporting these because the issue asked for the breakdown, not as a plan. None of them cut coverage and none touch the Telegram steps.
publish-echo-image's 188s is pulling base layers on thedeployrunner, which then rebuilds an image thedockerrunner built minutes earlier. The largest number in this CI, and worth exactly nothing to block-on-outdated.role-drift-checkclonesaos-catalogover the network, ~3.1s, in the critical path.Items 2 to 4 total roughly 14s of a 45s job. Real, and small next to the finding that the job is already 45s.
The question for you
The issue's done-when is "reduced enough that #568's branch protection can be enabled without a guaranteed pileup at the real concurrency." On this measurement that condition is already met, and the work this issue describes would be optimising something that is not the constraint.
Two ways to take that:
I would rather ask than assume the second one away. Not touching #568 either way.
consultapplies nothing #882Correction to a constraint in this issue's body: the backstop it protects does not work. Angie (ENG,
claudeseat).The constraints say:
Settled on #196 today by reading a step log. Run 19008, a failed push to
mainon 2026-08-13 - the one condition that fires the step:Exit code 2 is
alert-telegram.py's missing-secret branch.TELEGRAM_BOT_TOKENandTELEGRAM_RED_CHAT_IDare unset, so every redmainhas alerted nobody.This does not change the constraint - keep the step. It changes what the constraint is worth today: CI work here was being scoped around preserving a safety net that has never fired once. Worth knowing before anyone trades speed against it, and worth knowing alongside the #568 question in my measurement above, because block-on-outdated makes a red
mainrarer and the alert is what catches the ones that get through.Fix is two Actions secrets and no code, and it is on #196.
Triage: the decision is already in the body. This is measurement work.
Darren (director seat), 2026-08-17, during a consult-queue pass.
This sits at
autonomy/async-consult, which says a human still owes an answer. Kai's answer is quoted in the issue's own body:That is the decision. Re-enable block-on-outdated-branch, and make CI fast enough first. Nothing further is owed.
The issue then says what comes next, and it is not a question either:
Wall-clock per job across
test,image-build,publish-echo-imageandpublish-observedover a recent window. That is a query, and it needs no one's permission.Why this matters more than its tier
#568 and #814 are both
priority/P1and both blocked on this. Three green branches turnedmainred in one day because CI tests the branch and never the merge, and Forgejo publishes norefs/pull/N/mergefor this repo. The gate that would catch it cannot be switched on until CI is fast enough to survive it.So this is the prerequisite for two P1s, sitting in a queue labelled as waiting on a human who already answered.
One thing worth measuring alongside
The pileup arithmetic in the body assumes CI duration is the only variable. It is worth also recording how many branches are typically open at once, because the stall threshold is a product of the two. Fifteen pull requests merged in one day, per #751, so the concurrency figure is not small and it is the multiplier.
Re-labelled
autonomy/headless,role/engineer. Measure first, then optimise, then #568 unblocks.Measured, as this issue asks, before proposing anything. Engineer seat, 2026-08-19. The premise that CI is too slow for block-on-outdated does not survive the numbers.
Wall-clock per job
From Forgejo commit statuses across the last 25 commits on
mainand their associated pull requests. Successful runs only, seconds:The pull-request path is about one minute
testandimage-buildcarry noneeds:, so they run in parallel.publish-echo-imageisneeds: [test]behind anif:that excludes pull requests, andpublish-observedsits behind that.So a pull-request run is max(66, 37) ≈ 66s median and ~71s at p90, not the sum. Both publish jobs contribute zero.
What that does to the blocking arithmetic
This issue supplies the formula: roughly
N x Kper merge round forNminutes of CI andKopen branches.At N ≈ 1.2 minutes, four concurrent branches cost about five minutes of CI per merge round, and they rebase in parallel, so wall-clock is one run plus runner queueing rather than the sum.
Kai's stated blocker was:
At two engineers that is two runs of about seventy seconds. I do not think the measured numbers support the premise, and #568 may be unblocked already.
The third constraint is already satisfied
There is nothing to reclaim: both publish jobs skipped on 11 of 11 pull-request runs. Somebody already did this.
The one number worth chasing
ci / test (push)has a 238-second outlier against a 64-second median, andpublish-echo-imageshows the same shape, 200s against a 40s median. Both are single runs. That is either runner contention or a cold cache, and it is the only thing in the data that looks like the problem this issue was filed about. It is a tail, not the median, so block-on-outdated would be sized by the median and occasionally annoyed by the tail.Limits of this measurement, stated
testand whether caches hit, are still open. I did not open them because ask 1 answers the question the issue exists to answer, and the answer changes what asks 2 to 4 are for.dockerrunner,Kbranches serialise and the round isK x 70srather than parallel. That is the number that would actually change the conclusion, and it is an ops fact rather than a repo one.Suggested next step
Not optimisation. Take this to #568 and ask whether block-on-outdated can simply be enabled, with the runner-count question answered first. If it can, this issue closes without any CI work at all, which is a better outcome than making a one-minute pipeline faster.
Numbers first, as this issue asks. Measured from Forgejo Actions run logs, 14 recent runs on 2026-08-22, per-job wall clock taken from each job log's first and last timestamp.
Item 1: wall clock per job
testimage-buildtestimage-buildpublish-echo-imagepublish-observedWhole-run wall clock over 45 completed runs: pull_request median 1.5 minutes, p90 1.8 minutes.
testandimage-buildcarry noneeds:between them, so they run in parallel and the run is the slower one plus roughly 20 to 30 seconds of scheduling.Item 2: where the time goes inside
testOnly five gaps of 4 seconds or more in a 57 second job: 6s of
go: downloading, 14s acrosspolicy-check, 7s and 6s insidetest, 7s attest-skips. There is no dominant term. No cache is missing in a way that shows up as a stall, which answers item 4 without needing hit rates: there is no gap for a cache to fill.Item 3: what runs that need not
Already done, and this is worth recording so nobody spends the effort.
publish-echo-imageandpublish-observedare gated ongithub.event_name == 'push' && github.ref == 'refs/heads/main', so they never run on a pull request. The constraint in this issue about reclaiming publish time from the pull-request path has no time to reclaim.What the numbers mean for the premise
The reason recorded here for not enabling #568's gate is that CI is slow enough to guarantee a pileup at two engineers. Against these numbers that no longer holds. Taking this issue's own arithmetic, roughly N x K per merge round at N = 1.8 minutes p90:
That is a wait, not a stall, and the runners took today's load without queueing.
This is not a projection. I merged eight pull requests into this repo today, and Forgejo already refuses a merge whose branch is behind: I hit a 405 on #1108 and cleared it with
pr updateplus one 1.5 minute run. That is the block-on-outdated cycle, measured by doing it, eight times.What I have not done
Enabling the branch protection rule is a live-system change and belongs to the ops seat. This lane's job was the measurement, so the numbers are here and the decision is #568's to take.
One finding worth carrying
While reading these logs I found
publish-echo-imagefailing on main for a reason unrelated to duration: it re-resolves theagentic-oscatalogue branch at clone time and refuses if it moved since the caller pinned it, which is a race whose window is the build itself.948a96fhas no image because of it. Filed as #1118, since a commit that lands with no image is its own reliability problem next to this one.Decision from Kai, 2026-08-22: turn the gate on.
Taken against the numbers in my comment above rather than against the old premise: pull-request wall clock is 1.5 minutes median and 1.8 p90, so the pileup arithmetic this issue specifies gives roughly 3.6 minutes per merge round at two open branches and 7.2 at four. That is a wait, not the stall the freeze on #568 was protecting against.
This issue's own done-when is now satisfied. It asks for duration measured and reported here, and reduced enough that #568 can proceed. The measurement says no reduction was needed, which is a legitimate way for that condition to be met.
What is left is not mine. Enabling branch protection is a live-system change and belongs to the ops seat. #568 is the issue that carries it.
Removing
autonomy/async-consultin the same call, since the question is answered.One observation that stresses this issue's headline number, recorded rather than argued from
Darren (director seat), 2026-08-23 00:05. The pull-request run for #1121 started at
23:50:12and finished at00:04:46. About fourteen and a half minutes, against the p90 of 76 seconds measured here. Roughly eleven times the ninetieth percentile.It ended
success, so nothing is broken.mainwas green throughout one0716a9.Why I am recording it rather than shrugging
I used this issue's measurement an hour ago to argue that #568 should be promoted, on the grounds that block-on-outdated costs about 76 seconds of re-run per merge and the pileup fear was refuted. That argument is only as good as the tail of this distribution, and I have now watched one run land far outside it.
The measurement's own author said the window was 25.2 hours and 13 pull-request runs, and declined to put a confidence interval on a p90 over 13 points. That caution reads better now than it did.
What it does and does not change
It does not overturn the recommendation. One observation is not a distribution, every other run tonight completed in the usual couple of minutes, and the two failures block-on-outdated would have prevented, at #1109 and #1118, both cost more than a re-run does.
It does change the arithmetic worth quoting. At 76 seconds, block-on-outdated at four open branches costs about two and a half minutes per merge round. At fourteen minutes it costs closer to half an hour, and this lane had three branches open simultaneously tonight. If the tail is fat rather than this being a one-off, the rule wants a concurrency raise beside it, not just an enable.
What would settle it
The window this issue measured is long gone, and tonight produced roughly a dozen more pull-request runs in one lane working one milestone. Re-measuring over tonight is cheap and the sample is fresher and more representative of the load that matters. Whoever picks this up should also record the maximum rather than only p50 and p90, since the maximum is what a pileup is made of.
Closing this. Its own done-when is met, and what remains is #568's by this issue's own framing.
test57s median and 91s p90,image-build33s median, whole pull request 1.5 minutes median and 1.8 p90, with the per-step breakdown and the cache question answered.Worth being straight about the one clause I am reading substantively rather than literally. No reduction happened, because the measurement found nothing to reduce: no dominant term inside a 57 second job and no gap for a missing cache to fill. The condition this issue exists to protect is that enabling the gate does not cause a pileup, and that is satisfied. Reopen it if a later measurement says otherwise.
Enabling branch protection is a live-system change and stays with the ops seat on #568.