fix spanner metrics regression #2329
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recent changes mean client-side spanner metrics are no longer exposed the prometheus scrape endpoint. The SDK has deprecated OpenCensus support, which was wired into the prometheus endpoint, in favour of OpenTelemetry. This was reflected in a recent SpiceDB change, which made the otel approach the default, and as a consequence all prometheus metrics disappeared. This commit adds the prometheus exporter as a OpenTelemetry MetricsResolver, to add some the metrics back. The naming convention has changed, and I'm not aware of a way around that. Also client-side latency metrics are not supported via the opentelemetry integration. See https://cloud.google.com/spanner/docs/capture-custom-metrics-opentelemetry#capture-client-round-trip-latency Instead they now have to be manually instrumented.
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recent changes mean client-side spanner metrics
are no longer exposed the prometheus scrape endpoint.
The SDK has deprecated OpenCensus support, which was wired into the prometheus endpoint, in favour of OpenTelemetry. This was reflected in a recent SpiceDB change, which made the otel approach the default, and as a consequence all prometheus metrics disappeared.
This commit adds the prometheus exporter as a OpenTelemetry MetricsResolver, to add some the metrics back. The naming convention has changed, and I'm not aware of a way around that.
Also client-side latency metrics are not supported via the opentelemetry integration. See https://cloud.google.com/spanner/docs/capture-custom-metrics-opentelemetry#capture-client-round-trip-latency Instead they now have to be manually instrumented.