Description
The OpenTelemetry documentation at docs/opentelemetry.md needs to be updated to include information about the new fga-client.http_request.duration histogram metric that was added in PR #303.
Context
PR #303 introduced a new per-HTTP-request metric (HistogramHttpRequestDuration) that emits telemetry for each individual HTTP request, including retry attempts. The documentation should be updated to reflect this new metric alongside the existing metrics.
References
File to Update