_latencystatussampler

Overview ¶

Command latencystatussampler is a post-trace sampler plugin that drops a trace when its duration (in milliseconds, read from the "duration" tag) is below a configured threshold AND its "status" tag equals a configured success value. All other traces are kept. The sampler fails open: if either column is absent, nil, empty, or decoding returns an error, the trace is retained.

Build it as a Go plugin (the leading-underscore directory is intentionally excluded from `go build ./...` and linters, exactly like the reference _example directory, yet remains buildable by explicit path):

CGO_ENABLED=1 go build -buildmode=plugin -trimpath \
  -o latencystatussampler.so \
  ./test/plugins/_latencystatussampler

Config JSON (from SamplerPlugin.config Struct):

{ "thresholdMs": 500, "successValue": "success" }

Both fields are optional; defaults are 500 and "success" respectively.