The eBPFMetricsCollector function incorrectly handled the counter metric.

[tsint]

The method(https://github.com/open-telemetry/opentelemetry-ebpf-profiler/blob/main/tracer/tracer.go#L850-L864) used in the eBPFMetricsCollector function to evaluate cumulative metrics(counters) is incorrect. For example, the value of V8SymbolizationFailure(142) is greater than the value of support.MetricIDBeginCumulative(96).

        // The monitoring infrastructure expects instantaneous values (gauges).
        // => for cumulative metrics (counters), send deltas of the observed values, so they
        // can be interpreted as gauges.
        if ebpfID < support.MetricIDBeginCumulative {
            // We don't assume 64bit counters to overflow
            deltaValue := value - previousMetricValue[ebpfID]

            // 0 deltas add no value when summed up for display purposes in the UI
            if deltaValue == 0 {
                continue
            }

            previousMetricValue[ebpfID] = value
            value = deltaValue
        }

[fabled]

For example, the value of V8SymbolizationFailure(142) is greater than the value of support.MetricIDBeginCumulative(96).

These are not compared. The compare is against ebpfID or key of translateIDs or the C.metricID_* values which are defined in support/ebpf/types.h. What you refer to is seen in the value of the translateIDs map.

[tsint]

@fabled Oh, I see. Thank you for your answer.