internal/{worker/fetch}: include DB activity in load-shedding

Move the load-shedding logic to the worker and have it span both the
fetch and processing of the module (as previously) as well as
inserting it into the database.

This is a more accurate estimation of load, since running a lot of
concurrent queries definitely slows down processing.

Most of the time this won't make much difference, but under high load,
such as when processing multiple large modules, it will reduce DB
contention and should result in greater throughput.

For golang/go#48010

Change-Id: I7d0922e02d00182e867fd3b29fc284c32ecab5ee
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/346749
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>
11 files changed
tree: 230b553713bffd364321db456594aa70026c8dca
  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
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