feat(spanner): add new open census metrics for long-running sessions removal #8975
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[DO NOT MERGE]
This PR adds a new session pool metrics using open census.
cloud.google.com/go/spanner/num_long_running_sessions_removed
- The number of long-running sessions removed from the session pool.This
num_long_running_sessions_removed
metric will be emitted only whenActionOnInactiveTransaction
is eitherWarnAndClose
orClose
. This is because in rest of the cases there will be no change to this value and will always be0
.Wrote unit test for testing the new metric emitted.
Real time testing
Metric dashboard - (https://screenshot.googleplex.com/9YqA4bmHoDGwsbo)
Used the below sample code to test the metric