Add otel metrics export to the agent #3260
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Description
This is a bit of an experiment looking at what it would look like to build a set of metrics from the spans generated during execution of a job, currently these are written out to the logs of the agent and sent to buildkite.
I need to explore where to write this data, and what options there are to integrate it into otel tracing already present.
Context
Changes
Testing
go test ./...
). Buildkite employees may check this if the pipeline has run automatically.go fmt ./...
)