Allow customization of parent-override behaviour for inferred-spans - #1533
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| | otel.inferred.spans.duration <br/> OTEL_INFERRED_SPANS_DURATION | `5s` | The duration of a profiling session. For sampled transactions which fall within a profiling session (they start after and end before the session), so-called inferred spans will be created. They appear in the trace waterfall view like regular spans. <br/> NOTE: It is not recommended to set much higher durations as it may fill the activation events file and async-profiler's frame buffer. Warnings will be logged if the activation events file is full. If you want to have more profiling coverage, try decreasing `profiling_inferred_spans_interval` | | ||
| | otel.inferred.spans.lib.directory <br/> OTEL_INFERRED_SPANS_LIB_DIRECTORY | Defaults to the value of `java.io.tmpdir` | Profiling requires that the [async-profiler](https://github.com/async-profiler/async-profiler) shared library is exported to a temporary location and loaded by the JVM. The partition backing this location must be executable, however in some server-hardened environments, `noexec` may be set on the standard `/tmp` partition, leading to `java.lang.UnsatisfiedLinkError` errors. Set this property to an alternative directory (e.g. `/var/tmp`) to resolve this. | | ||
| | otel.inferred.spans.duration <br/> OTEL_INFERRED_SPANS_DURATION | `5s` | The duration of a profiling session. For sampled transactions which fall within a profiling session (they start after and end before the session), so-called inferred spans will be created. They appear in the trace waterfall view like regular spans. <br/> NOTE: It is not recommended to set much higher durations as it may fill the activation events file and async-profiler's frame buffer. Warnings will be logged if the activation events file is full. If you want to have more profiling coverage, try decreasing `profiling_inferred_spans_interval` | | ||
| | otel.inferred.spans.parent.override.handler <br/> OTEL_INFERRED_SPANS_PARENT_OVERRIDE_HANDLER | Defaults to a handler adding span-links to the inferred span | Inferred spans sometimes need to be inserted as the new parent of a normal span, which is not directly possible because that span has already been sent. For this reason, this relationship needs to be represented differently, which normally is done by adding a span-link to the inferred span. This configuration can be used to override that behaviour by providing the fully qualified name of a class implementing `BiConsumer<SpanBuilder, SpanContext>`: The biconsumer will be invoked with the inferred span as first argument and the span for which the inferred one was detected as new parent as second argument | |
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I wonder if you could use ComponentProvider, which is how file configuration is supporting configuring things like this (instead of fully-qualified class name)
cc @jack-berg
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Eventually this definitely would make sense I think. However, is the new structured config API already in a state so that we can fully replace the usage of the AutoConfigurationCustomizerProvider here? Because I don't think that we can simply mix in the ComponentProvider to my understanding
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makes sense
I sent a PR to your branch just to demonstrate what I was thinking: JonasKunz#1
but it does require depending on a bunch of internal / experimental classes, so really not sure if it's worth it yet
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ComponentProvider is for providing implementations of SDK plugin extension points referenced in the declarative confg files. I.e. samplers, processors, exporters, etc.
@trask it looks like you're using it to provide an implementation of ParentOverrideHandler (not an SDK plugin extension point), and using outside of declarative config.
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oh yeah, I was thinking maybe we could use component provider for custom declarative config stuff, but I guess declarative config has no way to know about what nodes represent components and what provider types to use
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Description:
The inferred spans extension sometimes has to insert inferredspans inbetween the parent-child relationship of normal spans for correctness.
This is however not directly possible, that is why we represent this as a span-link on the inferred spans. This PR adds a configuration hook to fully customize this behaviour with a custom handler.
The main reason for adding this is because in our elastic vendor distro of the opentelemetry agent we are still shipping the pre-contribution version of inferred spans. We currently still have to do this, because there these special span links are marked with an
elastic.is_childinstead of justis_childattribute and older versions of our backend rely on this elastic-specific attribute.With this change we can switch to this contributed version of inferred spans and add the
elastic.is_childattribute on the span link via the customization hook.