fix: Correctly determine project ID for metrics export #2427
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🤖 I have created a release *beep* *boop* --- ## [8.2.2](https://togithub.com/googleapis/nodejs-spanner/compare/v8.2.1...v8.2.2) (2025-10-07) ### Bug Fixes * Correctly determine project ID for metrics export ([#2427](https://togithub.com/googleapis/nodejs-spanner/issues/2427)) ([0d63312](https://togithub.com/googleapis/nodejs-spanner/commit/0d633126a87c1274abfd59550cb94052a819fcaa)) * Metrics Export Error log ([#2425](https://togithub.com/googleapis/nodejs-spanner/issues/2425)) ([110923e](https://togithub.com/googleapis/nodejs-spanner/commit/110923ea1dc6f6c891e0f70406b3839224a25b9e)) --- This PR was generated with [Release Please](https://togithub.com/googleapis/release-please). See [documentation](https://togithub.com/googleapis/release-please#release-please).
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Fixes #2420
This PR addresses an issue where the project ID for metrics export was not being correctly determined when not explicitly provided.
Specifically, this PR introduces the following changes:
Infers Project ID from Credentials: When a Spanner instance is created without a projectId in the spanner options, the project ID is now fetched from the authentication credentials. This ensures that metrics are correctly exported to the appropriate project, resolving an issue where a placeholder {{project_id}} was being used.
This PR also makes the
projectIdattribute to be non-optional inMetricsTracerFactory.getInstancemethod