LOG-9375: Enhance the prometheus exporter with SAR auth strategy

[jcantrill]

This PR:

• Adds auth.strategy 'sar' (SubjectAccessReview) to the prometheus export sink
• Allows the sink to be protected by a well-known kubernetes pattern

Tested by granting the collector service account the permissions identified in the API notes and configuring like:

 [sinks.prometheus_output.auth]
strategy = "sar"
path = "/metrics"
verb = "get"

Ref: https://redhat.atlassian.net/browse/LOG-9375

cc @vparfonov

[openshift-ci-robot]

@jcantrill: This pull request references LOG-9375 which is a valid jira issue.

Details

In response to this:

This PR:

• Adds auth.strategy 'sar' (SubjectAccessReview) to the prometheus export sink
• Allows the sink to be protected by a well-known kubernetes pattern

Tested by granting the collector service account the permissions identified in the API notes and configuring like:

 [sinks.prometheus_output.auth]
strategy = "sar"
path = "/metrics"
verb = "get"

Ref: https://redhat.atlassian.net/browse/LOG-9375

cc @vparfonov

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jcantrill

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[jcantrill]

/label tide/merge-method-squash

[openshift-ci]

@jcantrill: The label(s) tide/merge-method-squash cannot be applied, because the repository doesn't have them.

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In response to this:

/label tide/merge-method-squash

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[jcantrill]

/test cargo-clippy-check

[jcantrill]

/test unit

[jcantrill]

/hold

[jcantrill]

/label tide/merge-method-squash

[openshift-ci]

@jcantrill: The label(s) tide/merge-method-squash cannot be applied, because the repository doesn't have them.

Details

In response to this:

/label tide/merge-method-squash

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[jcantrill]

/hold cancel

[vparfonov]

/lgtm