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Archiver Metrics

These metrics are emitted by the tiered archiver in korvet-storage-segmented.

Archiver failures written to the dead-letter stream.

Name: korvet.storage.archiver.deadletter_writes
Type: counter

Table 1. Tags
Key	Description
`phase`	Logical archiver phase (e.g. `plan`, `write`, `ack`).

Archiver failures by phase, exception class, and severity.

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

Table 2. Tags
Key	Description
`error_type`	Exception class simple name.
`phase`	Logical archiver phase (e.g. `plan`, `write`, `ack`, `start`).
`severity`	Failure severity ( `normal` or `critical`).

Maximum archiver lag observed across streams.

Name: korvet.storage.archiver.lag
Type: gauge
Base unit: seconds

Pending archiver messages reclaimed from the source tier.

Name: korvet.storage.archiver.reclaimed_messages
Type: counter

Archiver planning scan latency.

Name: korvet.storage.archiver.scan
Type: timer
Base unit: seconds

Table 3. Tags
Key	Description
`result`	Outcome of the archiver operation (e.g. `success`, `error`, or stream-state value).

Archiver streams tracked by state.

Name: korvet.storage.archiver.stream_state
Type: gauge

Table 4. Tags
Key	Description
`result`	Outcome of the archiver operation (e.g. `success`, `error`, or stream-state value).

Whether the archiver is currently running.

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