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jackshirazi merged 2 commits into from
Jan 19, 2023
Merged

Doc add first stack trace detail #2978

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c5844ab
clarify lack of stack trace in first sample
jackshirazi Jan 19, 2023
b8d701d
clarify lack of stack trace in first sample and UI
jackshirazi Jan 19, 2023
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6 changes: 6 additions & 0 deletions docs/method-monitoring.asciidoc
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Expand Up @@ -144,6 +144,12 @@ They may start after the method actually started, and end before the method actu
This can lead to inconsistencies, all of which are documented in the
https://github.com/elastic/apm-agent-java/tree/main/apm-agent-plugins/apm-profiling-plugin[apm-profiling-plugin readme].

Also note that the very first inferred span in a transaction doesn't have a stack trace as it's
likely to be untypical - it's usually the entry point and has a lot of stuff in it about how the
server has accepted a request etc. Consecutive inferred spans have a stack trace that go to their parent.
This means that long running methods may show as a span from the inferred span mechanism, but not
show an associated stack trace.

// Inferred spans are created after the profiling session ends and therefor may appear later in the APM app's span timeline than regular spans.
// Because of this, a regular span cannot be the child of an inferred span.

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