fix(node-otel): Refactor OTEL span reference cleanup #9000
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AbhiPrasad
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Sep 12, 2023
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Update: This PR was updated with new behaviour.
This PR updates the span reference cleanup to take into account if a span is/may still be referenced somewhere else.
Previously, whenever a span finished we removed the reference from the map, to clean up and avoid memory leaks.
However, it seems that sometimes spans are ended before a child span is started (at least the hooks may fire in this order). This leads to the potential case where a parent that should exist cannot be found, thus creating a new transaction instead of a span.
With this change, we keep more information in our span map, in order to clear sub-spans (=not transactions) only when the root span (=transaction) is finished.