parseFilesSequentially log spew with large number of coverage enabled Bazel targets

[tingilee]

Description of the bug:

Hi,

We have a pretty large codebase with coverage turned on. This is a snippet of the bazel coverage //... output:

(01:51:40) [32mINFO: [0mFrom Coverage report generation:
Feb 15, 2023 1:48:03 AM com.google.devtools.coverageoutputgenerator.Main getTracefiles
INFO: Found 13917 tracefiles.
Feb 15, 2023 1:48:03 AM com.google.devtools.coverageoutputgenerator.Main parseFilesSequentially
INFO: Parsing file bazel-out/k8-fastbuild/testlogs/rh_owners_certify_test/coverage.dat
...

We have ~14K instances of the following logs, one for every tracefile generated:

Feb 15, 2023 1:48:03 AM com.google.devtools.coverageoutputgenerator.Main parseFilesSequentially
INFO: Parsing file bazel-out/k8-fastbuild/testlogs/rh_owners_certify_test/coverage.dat

This causes a lot of logspew and we eventually hit:

stderr (/cache/bazel/6fadd30f776596320f945376fa05bc65/execroot/rh/bazel-out/_tmp/actions/stderr-67999) 3009367 exceeds maximum size of --experimental_ui_max_stdouterr_bytes=3000000 bytes; skipping

Here is the parsing File logging logic: https://github.com/bazelbuild/bazel/blob/e8a69f5d5acaeb6af760631490ecbf73e8a04eeb/tools/test/CoverageOutputGenerator/java/com/google/devtools/coverageoutputgenerator/Main.java#L313

I would like to propose making this logging DEBUG level. I'd appreciate guidance on the best practices for changing log levels (ideally configurable by some bazel flags).

What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

bazel coverage //...

Which operating system are you running Bazel on?

Linux, Mac

What is the output of bazel info release?

release 6.0.0

If bazel info release returns development version or (@non-git), tell us how you built Bazel.

No response

What's the output of git remote get-url origin; git rev-parse master; git rev-parse HEAD ?

No response

Have you found anything relevant by searching the web?

No response

Any other information, logs, or outputs that you want to share?

No response