Mapper Metrics

These metrics are emitted by korvet-mapper.

Metrics

Compression Ratio

Compression ratio recorded by mapper compression operations. The distribution’s _count also reports the compression event count per algorithm.

Name: korvet.mapper.compression_ratio
Type: distribution summary

Table 1. Tags
Key	Description
`compression`	Compression algorithm (e.g. `none`, `gzip`, `snappy`, `lz4`, `zstd`).

Failures

Mapper failures by operation and exception class.

Name: korvet.mapper.failures
Type: counter

Table 2. Tags
Key	Description
`error_type`	Exception class simple name normalised to lower case.
`operation`	Logical mapper operation name.

Operation

Mapper operation latency, observed per call. Tagged with the logical operation name and outcome ( success, error). Use the timer’s _count for operation counts.

Name: korvet.mapper.operation
Type: timer
Base unit: seconds

Table 3. Tags
Key	Description
`operation`	Logical mapper operation name.
`result`	Operation outcome (e.g. `success`, `error`).

Payload Size

Mapper payload sizes in bytes, by operation and phase.

Name: korvet.mapper.payload_size
Type: distribution summary
Base unit: bytes

Table 4. Tags
Key	Description
`operation`	Logical mapper operation name.
`phase`	Mapper phase (e.g. `input`, `output`).