Add span skip attribute for span metrics generation #1626
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #1626 +/- ##
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- Coverage 71.18% 71.18% -0.01%
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Files 197 197
Lines 19881 19911 +30
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+ Hits 14153 14174 +21
- Misses 5044 5059 +15
+ Partials 684 678 -6
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mariomac
approved these changes
Feb 10, 2025
pkg/export/alloy/traces.go
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| if tr.spanMetricsEnabled { | ||
| traceAttrs[attr.SkipSpanMetrics] = struct{}{} | ||
| } | ||
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Looks duplicate (already inside getConstantAttributes)
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Ah nice catch, I moved it there so I can make the test and forgot to take out out.
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Beyla can directly generate span metrics for quick access to unified metrics and service graphs without the need for trace generation. This mainly done to ensure we can generate accurate metrics even in case of trace sampling with head sampling. Tail sampling doesn't need this option, however it does usually require higher compute cost.
In case we generate span metrics directly from Beyla and we also generate traces, some data will be duplicated if the collector has also enabled the span metrics processor. To help with filtering double counted metrics, this PR introduces a new attribute which will get attached to the spans, signalling that the span metrics are already generated and they can be ignored by the span metrics processor. The span metrics processor can check for this flag and drop the trace sample from metrics.
The new attribute is
span.metrics.skip = true.