Expose bpfman metrics via OpenTelemetry

[dave-tucker]

bpfman may have some internal metrics that we might like to expose to opentelemetry.

In order for this to work:

1. bpfman would write metrics into the sled database when it is running
2. Another process bpfman-metrics-exporter (not to be confused with bpf-metrics-exporter) would use the Otel SDK to read the metrics from the database.

[harisudarsan1]

Is this issue requires additional work or to be closed as otel sdk is already integrated?

[Billy99]

@harisudarsan1 So had to hunt down Dave (who reopened) to get clarification. This is still open. This Issue tracks adding bpfman specific metrics, which would allow someone to verify bpfman is working properly or debug an issue in bpfman. #579 is complete which tracked metrics on eBPF programs that are loaded.

[harisudarsan1]

Thanks @Billy99 for the clarification