[bc-hvtk]

The cooldown library reads a duration it can't parse as 0 (d, _ := ParseDuration(v) in cooldown.parseDurations), so a top-level value such as default: "1w", "7 days" or PROXY_COOLDOWN_DEFAULT=1w turns cooldown off with no sign of it. Validate and Policy() both succeed and For() returns 0.

Durations under cooldown.profiles are already rejected at startup by validateProfileDurations. The top-level default, ecosystems and packages were never checked, and the Shortest() comment said Validate reported them. (package_patterns durations are already refused by cooldown.NewPolicy at startup, so they are left alone.)

Change

• CooldownConfig.durationWarning runs the existing validateProfileDurations over the top-level default, ecosystems and packages.
• Config.Warnings() includes its message, so server.Start logs it next to the other startup warnings, for example:
  cooldown: invalid default: invalid duration "1w": ...; no cooldown applies where this value is used
• It warns rather than failing to start, so configs that start today keep starting. Turning this into a startup error, to match profiles, would be a behaviour change, so I've left that for a separate discussion.
• docs/configuration.md lists the accepted units and describes the warning. The Shortest() comment is corrected.

Testing

• New tests in internal/config/cooldown_profiles_test.go:
  • 1w, 7 days, -3d, 3days and soon in default, ecosystems and packages warn, and Validate still passes;
  • "", 0, 3d, 1.5d, 48h and 90m don't warn;
  • the env var path warns;
  • an invalid package_patterns duration still fails Policy() and produces no warning.
• The warning tests fail without the change.
• go fmt, go vet, go test -race ./... and golangci-lint run ./... (v2.15.0) are clean.

I used Claude (an AI assistant) to find this and help write the change. I've read and checked the diff.

Summary by CodeRabbit

• Documentation
  • Clarified how unsupported cooldown durations are handled.
• Bug Fixes
  • Invalid top-level cooldown durations now produce a startup warning and apply no cooldown, rather than causing configuration validation to fail.
  • Invalid durations in cooldown profiles continue to reject startup.

[coderabbitai]

No actionable comments were generated in the recent review.

Walkthrough

Top-level cooldown durations that fail validation now produce configuration warnings. Tests cover invalid and valid values, including a value loaded from an environment variable. The documentation describes top-level warning behavior and profile-duration startup rejection.

Changes: Cooldown duration warnings

Layer / File(s)	Summary
Validate and report cooldown durations internal/config/config.go, internal/config/cooldown_profiles.go, internal/config/mirror.go, internal/config/cooldown_profiles_test.go, docs/configuration.md	durationWarning checks configured cooldown durations, and Config.Warnings adds a non-empty warning. Tests cover invalid, valid, and environment-loaded values. The documentation describes top-level warning behavior and profile-duration startup rejection.

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Suggested reviewers: andrew, simonchrz

Merge Risk: Minimal · up to 4c3cd

Invalid top-level cooldown durations now produce a startup warning instead of being silently ignored. Startup is unaffected, and the docs match the behavior. No merge-blocking risk remains.

Security architecture risk: Minimal · up to 4c3cd

The change makes invalid cooldown settings more visible without changing which configurations start or how cooldown policies are enforced. No introduced or worsened architecture-level security risk was established.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title names the main change: a warning is now emitted when a top-level cooldown duration (default, ecosystems, packages) cannot be parsed. The changeset adds durationWarning, wires it into Config.…
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Explanation

The title names the main change: a warning is now emitted when a top-level cooldown duration (default, ecosystems, packages) cannot be parsed. The changeset adds durationWarning, wires it into Config.Warnings, and adds tests and docs for this behavior. The objectives describe the same warning behavior. The commit message narrows the scope to default, ecosystems, and packages, but the title still matches the core change.

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Actionable comments posted: 1

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Inline comments:
Review comments at @docs/configuration.md:
- Line 1278: Update the duration documentation to limit the warning-only
behavior to top-level values in default, ecosystems, and packages; state that
invalid durations in package_patterns prevent startup rather than merely
applying no cooldown. Keep the existing distinction that invalid
cooldown.profiles durations are rejected at startup.

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[simonchrz]

Thanks, this is a real gap: a typo like 1w silently turns cooldown off. Reusing validateProfileDurations keeps the accepted syntax in one place, and the tests cover the cases I'd want.

One small thing: validateProfileDurations returns the first error only, so a config with two bad values warns about one per start. Listing all of them in one warning would save a round trip, but I'm fine either way.

The open question is yours, @andrew: warn as here, or refuse to start as profiles already do? An invalid top-level value turns cooldown off, so failing would be safer, but it changes behaviour for configs that start today.