Lack of documentation on queue-proxy probing

[mbrancato]

Describe the change you'd like to see
Comprehensive documentation on queue-proxy probing controls and behaviors.

Additional context
Readiness probing, and specifically aggressive probing, is part of the queue-proxy sidecar. Some services are slower to start than others, may have backend dependencies such as a database, etc. However, there is really no documentation on how to configure the queue-proxy probing behavior in the documentation.

e.g. As of today there are conflicting notes / comments that seem to describe the same thing about disabling aggressive probing, with opposite instructions in another knative project. One says to set periodSeconds>0 while the other says to set periodSeconds=0 to disable aggressive probing.

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[mbrancato]

/reopen

[knative-prow]

@mbrancato: Reopened this issue.

In response to this:

/reopen

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[mbrancato]

/remove-lifecycle stale

[dprotaso]

/lifecycle frozen