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Trimmer Metrics

These metrics are emitted by tiered storage maintenance in korvet-storage-tiered.

Trimmer failures by lifecycle phase and error type.

Name: korvet.storage.trimmer.failures
Type: counter

Table 1. Tags
Key	Description
`error_type`	Exception class simple name.
`phase`	Logical trimmer phase (e.g. `start`).

Retention trim outcomes. The total per tier is derivable as the sum over results, so a separate streams-visited counter is unnecessary.

Name: korvet.storage.trimmer.outcomes
Type: counter

Table 2. Tags
Key	Description
`result`	Trim outcome (e.g. `success`, `error`).
`tier`	Storage tier (e.g. `local`, `remote`).

Retention sweep duration.

Name: korvet.storage.trimmer.sweep
Type: timer
Base unit: seconds

Whether the trimmer is currently running.

Name: korvet.storage.trimmer.up
Type: gauge