docs: on std a cancel of StartWithContext's context now keeps ShutdownTimeout (celeris#753)

[FumingPower3925]

Matches goceleris/celeris#803 (fixes celeris#753). Merge after it.

On std, a cancel of StartWithContext's context now keeps Config.ShutdownTimeout: the hooks run, and StartWithContext returns, at the deadline, while a handler still running keeps running and still answers. Before, the hooks and the call waited for the handler. The graceful-shutdown page said so in three places ("on std a cancel does not keep to it today", the FAQ's std bullet, the pitfall about exiting early); they now describe v1.6.0 and keep the old behaviour as the pre-v1.6.0 note. The measured line gains the new number: with a 500 ms deadline and a request held 2 s, a cancel on std ran the hooks and StartWithContext returned at 501 ms (celeris PR #803, evidence/lanes-20260927/WRITE/753/probe/probe-3d601ec-m8.log).

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Clarified that cancelled StartWithContext uses a single shutdown deadline for draining and shutdown hooks, defaulting to 30 seconds when the configured timeout is unset or non-positive.
  • Explained that shutdown can complete at the deadline while a handler is still running, and that the handler’s response may be cut off if the process exits.
  • Updated the shutdown timing notes.

Walkthrough

The graceful-shutdown guide updates its std description of shutdown deadlines, hooks and cancelled StartWithContext, including the documented timing results.

Changes

Graceful shutdown documentation

Layer / File(s)	Summary
Document std cancellation behaviour src/content/docs/graceful-shutdown.md	Lines 68–71, 623, 672–677 and 686–688 update the std shutdown description, pitfall note, example and measured results for cancelled StartWithContext. The text states that it returns at the shutdown deadline after hooks run, even if a handler is still running. It also distinguishes behaviour before v1.6.0 and retains the direct-Shutdown description.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~5 minutes

Change: Other

Merge Risk: 🔵 Low · up to 283ed

The shutdown guidance is supported, but the page still has a small spelling inconsistency to correct before it fully matches the documentation requirements.

Architecture Summary

Architecture risk: 🔵 Low · up to 283ed

The change affects 1 system.

Changed systems: src

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — src (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in src/content/docs/graceful-shutdown.md: The std description now says that Shutdown runs the hooks within the same deadline as the drain, and that StartWithContext returns after the engine stops and Shutdown completes. It contrasts this with the previous behaviour, where cancellation could wait for running handlers beyond the deadline.
• observed — Modified behavior in src/content/docs/graceful-shutdown.md: The std pitfall note now includes cancelled StartWithContext among the calls that return when the shutdown deadline expires while handlers may still be running; previously, it mentioned only Start.
• observed — Modified behavior in src/content/docs/graceful-shutdown.md: The std case now specifies that cancelled StartWithContext returns at ShutdownTimeout, after the hooks, while a handler may continue running and its response may be cut off if the process exits. It also says that before v1.6.0, cancellation waited for the handler instead of stopping at the deadline. The existing direct-Shutdown behaviour is retained.
• observed — Modified behavior in src/content/docs/graceful-shutdown.md: The measured std results now say that, since v1.6.0, cancellation runs the hooks and returns from StartWithContext at the deadline; the previous 2.17–2.19 second timing is identified as pre-v1.6.0 behaviour.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title uses the required docs: prefix and describes the change in src/content/docs/graceful-shutdown.md (line not provided). Its summary is declarative, not imperative.	Use an imperative summary, such as docs: document std StartWithContext cancellation timeout behaviour. The source file line is not available in the supplied context.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description directly explains the documentation update in src/content/docs/graceful-shutdown.md (line not provided), including the updated StartWithContext and ShutdownTimeout behaviour.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Benchmark Provenance	✅ Passed	The pull request changes only src/content/docs/graceful-shutdown.md. It adds raw shutdown timing values at lines 679–687, including 501 ms, but it does not add requests-per-second data, a latency …

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/content/docs/graceful-shutdown.md:
- Line 623: Update the spelling in the graceful-shutdown documentation so
“cancelled” is used consistently, including changing the existing “canceled”
occurrence; leave the already-correct occurrences unchanged.

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📒 Files selected for processing (1)

• src/content/docs/graceful-shutdown.md

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• goceleris/celeris (manual)
• goceleris/probatorium (manual)
• goceleris/loadgen (manual)

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• GitHub Check: Workers Builds: goceleris-docs

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📓 Path-based instructions (2)

These pages document the Celeris framework (goceleris/celeris, linked below).

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Files:

• src/content/docs/graceful-shutdown.md

Source excerpt: Benchmark provenance: Fail if the pull request adds or changes a benchmark figure (requests per second, a latency percentile, memory or CPU usage, or a ratio or percentage comparing Celeris with another framework) in src/con...

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Files:

• src/content/docs/graceful-shutdown.md

🪛 LanguageTool

src/content/docs/graceful-shutdown.md

[uncategorized] ~623-~623: Do not mix variants of the same word (‘cancelled’ and ‘canceled’) within a single text.
Context: ...l be running, and so do Start and a cancelled StartWithContext (see the FAQ...

(EN_EXACT_COHERENCY_RULE)

---

[uncategorized] ~673-~673: Do not mix variants of the same word (‘cancelled’ and ‘canceled’) within a single text.
Context: ...rns when that Shutdown returns, and a cancelled StartWithContext at `ShutdownTimeou...

(EN_EXACT_COHERENCY_RULE)

🔀 Multi-repo context goceleris/celeris, goceleris/probatorium

Linked repositories findings

goceleris/celeris

• The implementation matches the documented behavior: StartWithContext creates a 30-second default timeout (or uses Config.ShutdownTimeout) and waits for shutdown/hooks before returning. [::goceleris/celeris::] server.go:1028-1067,1128-1133
• The std regression test explicitly verifies that after a 300 ms timeout, hooks run and StartWithContext returns while the held handler remains active; releasing it later still produces its response. [::goceleris/celeris::] std_cancel_shutdown_timeout_test.go:16-29,124-155
• std.Engine.Shutdown cancels the drain and request contexts when the shutdown deadline expires, confirming the timeout bounds the shutdown lifecycle rather than forcibly terminating the handler. [::goceleris/celeris::] engine/std/engine.go:244-266
• Config.ShutdownTimeout is documented as one deadline covering the in-flight drain followed by OnShutdown hooks. [::goceleris/celeris::] config.go:110-114

goceleris/probatorium

• The benchmark Celeris adapter does not use StartWithContext; it uses Start() and performs direct Server.Shutdown with its own 10-second context on SIGTERM/SIGINT. [::goceleris/probatorium::] servers/celeris/server.go:115-120,141-156
• Therefore, the PR’s StartWithContext-specific behavior does not change the benchmark adapter’s shutdown path.

🔇 Additional comments (1)

src/content/docs/graceful-shutdown.md (1)

68-70: LGTM!

Also applies to: 672-672, 674-677, 686-688