chore(deps): update rust crate metrics to v0.24.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
metrics	dependencies	patch	0.24.3 → 0.24.6

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Release Notes

metrics-rs/metrics (metrics)

v0.24.6

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v0.24.5

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v0.24.4

Compare Source

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[doubleword-code]

Summary

This PR updates the metrics crate from v0.24.3 to v0.24.6 via Cargo.lock. This is a routine dependency update that includes three upstream releases (v0.24.4, v0.24.5, v0.24.6) containing internal improvements and critical bug fixes.

Verdict: Approved - This is a safe update with no breaking changes for this codebase's usage pattern.

Research notes

I reviewed the metrics crate changelog for versions 0.24.4 through 0.24.6:

• v0.24.6 (2026-05-13): Fixed a regression in the deprecated KeyHasher that caused hash map entry duplication after resize in metrics_util::registry::Registry
• v0.24.5 (2026-04-29): Fixed a label hashing regression where identical label names with different values could collide
• v0.24.4 (2026-04-28): Internal hasher swapped from ahash to rapidhash for faster allocation-free hashing; key hashes now computed eagerly at construction time

The outlet codebase only uses the counter!() emission macro (e.g., counter!("outlet_queue_dropped_total").increment(1)), which is part of the stable public API unaffected by these internal hasher changes. The KeyHasher fix in v0.24.6 specifically benefits users of metrics_util::registry::Registry or the deprecated metrics::KeyHasher type—neither of which this project uses.

Suggested next steps

1. Merge as-is - This update includes upstream bug fixes that improve correctness without any API changes affecting this codebase.

General findings

None. The change is limited to Cargo.lock and correctly reflects the transitive dependency shift from ahash to rapidhash. The metrics usage in src/lib.rs (lines 99, 319, 321, 544, 767, 771, 881, 884) uses only the standard emission macros which remain unchanged.