fix: Connectivity Error Metrics #4220
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This PR enhances the connectivity error metrics in the Java Spanner client library to provide a more accurate and comprehensive tracking of network-related issues.
Description:
The current connectivity error metric is only incremented in the rare event that a response header is received from the server but lacks GFE/AFE server timing latency. This limitation means that more common and critical connectivity problems are not captured, such as:
To address this gap, this change updates the logic to also capture RPCs that have been passed to the gRPC transport layer but for which no response is received. This will result in a more accurate and reliable connectivity error metric.
Note Client-side timeouts that occur before an RPC is sent to the transport layer are explicitly excluded from this metric.