Add connection pool metrics #1329
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This is based on the specification at https://github.com/open-telemetry/semantic-conventions/blob/main/specification/metrics/semantic_conventions/database-metrics.md. Signed-off-by: Bradley Grainger <[email protected]>
The FakeMySqlServer setup fails under Appveyor and Azure Pipelines. Signed-off-by: Bradley Grainger <[email protected]>
Make min/max connections metrics an ObservableUpDownCounter, as they are effectively static metrics for a pool. Signed-off-by: Bradley Grainger <[email protected]>
Signed-off-by: Bradley Grainger <[email protected]>
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Fixes #491
This is based on the specification in #1328.