internal/config: get instance ID from metadata

If the instance ID is not available from an environment variable,
query the GCE metadata for it.

This is necessary for Cloud Run. Its instance ID isn't available from
an environment variable as App Engine's is, and without something to
distinguish instances, metrics from multiple instances look the same
and cause the StackDriver error "One or more points were written more
frequently than the maximum sampling period configured for the
metric."

Also, log the monitored resource we use for metrics to aid in
debugging.

Change-Id: I477644572348bc72440c424ba84c2fc378c3fe35
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/357037
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
2 files changed
tree: 4e2ca9a7817687ce2d9fee190ea57b5422032de3
  1. cmd/
  2. devtools/
  3. doc/
  4. internal/
  5. migrations/
  6. static/
  7. tests/
  8. third_party/
  9. .dockerignore
  10. .eslintignore
  11. .eslintrc.yaml
  12. .gitignore
  13. .prettierignore
  14. .prettierrc.yaml
  15. .stylelintignore
  16. .stylelintrc.yaml
  17. all.bash
  18. cloudbuild.yaml
  19. CONTRIBUTING.md
  20. go.mod
  21. go.sum
  22. jest.config.js
  23. LICENSE
  24. package-lock.json
  25. package.json
  26. PATENTS
  27. README.md
  28. tsconfig.json
README.md

Pkg.go.dev

Go Reference

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