roachprod-microbench: improvements to reporting

[herkolategan]

This change introduces a few small improvements to the reporting capabilities in roachprod-microbench. Missing microbenchmarks are now classified by timeouts, errors, or skipped status. These will be outputted to the log for inspection afterward.

Also adds a quiet mode for reducing unnecessary output on CI builds.

[cockroach-teamcity]

This change is 

[renatolabs]

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @herkolategan and @smg260)

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pkg/cmd/roachprod-microbench/benchmark.go line 316 at r1 (raw file):

			}
			tag := fmt.Sprintf("%d", logIndex)
			if response.ExitStatus == 124 {

The details are fuzzy to me -- where is this exit status coming from? I think it comes from run.sh, but can't remember what that file is/where it's located.

[herkolategan]

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @renatolabs and @smg260)

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pkg/cmd/roachprod-microbench/benchmark.go line 316 at r1 (raw file):

Previously, renatolabs (Renato Costa) wrote…

The details are fuzzy to me -- where is this exit status coming from? I think it comes from run.sh, but can't remember what that file is/where it's located.

Correct, although the remote command (runCommand in benchmark.go) that eventually gets executed is built up from a few parts including a possible timeout. It's the timeout part of the command that will result in the 124 exit status here, given there was a timeout.

[herkolategan]

bors r=renatolabs

[craig]

Timed out.

[herkolategan]

bors r=renatolabs

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)