internal/trace/v2: dump text trace on failure only if it fits in the log

Currently we dump text traces to the build log on failure
unconditionally, but this may cause the old infrastructure's builds'
logs to get truncated. Avoid that by setting a threshold on the maximum
size of the text trace we're willing to dump.

We don't need this workaround on the new infrastructure -- logs don't
get truncated there.

Change-Id: I0f50f50bb4b90f87250b673fbe56f48235325610
Reviewed-on: https://go-review.googlesource.com/c/go/+/544216
Auto-Submit: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
1 file changed
tree: bc692189a0f4e81b542fcacfcde7292cae0c84af
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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