plugins/telemetry/v1.6.0

maximhq/bifrostplugins/telemetry/v1.6.0Aug 26, 2026by akshaydeo

AI Summary

Adds overhead latency histogram metrics and deprecates legacy Prometheus header handling in the telemetry plugin.

Key Highlights

Add bifrost_overhead_latency_microseconds histogram
Deprecate x-bf-prom-* headers for Prometheus label dimensions

Breaking Changes

Deployments relying on x-bf-prom-* headers to add Prometheus label dimensions will lose those labels; use custom label configuration instead.

New Features

Microsecond-scale overhead latency histogram
No-op HTTPTransportPreAuthHook

Full Release Notes

## Plugin Release: telemetry v1.6.0

- feat: `bifrost_overhead_latency_microseconds` histogram measured across the HTTP transport hooks as total request time minus time blocked on upstream provider sockets, with a microsecond-scale bucket set (#6345)
- chore: `x-bf-prom-*` request headers are no longer consumed as Prometheus label dimensions in `collectPrometheusKeyValues` and `applyCustomLabels` (the prefix is still stripped from forwarded requests), and legacy `gen_ai.*` attribute emission is removed (#6403)
  <Warning>
  Deployments that relied on `x-bf-prom-*` request headers to add Prometheus label dimensions lose those labels; use the supported custom label configuration instead.
  </Warning>
- feat: add a no-op `HTTPTransportPreAuthHook` for the new pre-authentication transport phase (#6375)
- chore: upgraded core to v1.8.0 and framework to v1.6.0

### Installation

```bash
# Update your go.mod to use the new plugin version
go get github.com/maximhq/bifrost/plugins/telemetry@v1.6.0
```

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_This release was automatically created from version file: `plugins/telemetry/version`_