aws-janitor: add job duration metric

[cpanato]

...to collect the response time when running this job

this is a short live job, and then we cannot guarantee that we will have someone to scrape the data at the correct time, to avoid that, we need to use the Prometheus PushGateway to store the metrics and then have Prometheus scrape the PushGateway, however, the problem continues, we need to make sure the metrics are pushed to the PushGateway in time.

So for that, we need to push ourselves, then the approach in this PR is to push when exiting the job

this is part of #13

opening this PR for feedback and see if sounds good

a screenshot for the metric pushed to PushGateway

/assign @ixdy

[ixdy]

thanks for this PR! just a few minor suggestions, otherwise this largely LGTM

[ixdy]

no action required in this change, but in the future it might be worth reporting how many resources were deleted, too (see line directly above this one, I just can't comment on it directly)

(there's probably a similar count obtainable from CleanAll())

[cpanato]

thanks for your review and feedback Jeff

Added a metric to report the sweep, the CleanAll() function does not return how many resources were deleted, but i think we can add that, i can do that if you think that will be good

ptal

[ixdy]

yeah, we'd need to pass that information back from CleanAll(), but that can happen separately.

[ixdy]

yeah, we'd need to pass that information back from CleanAll(), but that can happen separately.

[k8s-ci-robot]

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