google-cloud-go
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feat(spanner): Add x-goog-spanner-end-to-end-tracing header for requests to Spanner
To enable end to end tracing on Spanner layer, client needs to opt-in by setting the EnableServerSideTracing
flag in ClientConfig. If enabled a new http header x-goog-spanner-end-to-end-tracing
will be passed in Spanner requests.
Design doc: go/cs-tracing-mvp