Write process start time to prometheus options so that scraping clients can parse it first #118820
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: logicalhan The full list of commands accepted by this bot can be found here. The pull request process is described here
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What type of PR is this?
/kind cleanup
What this PR does / why we need it:
This PR leverages prometheus/client_golang#1278 which includes process start time in a header, allowing scraping clients to immediately start streaming and processing metrics rather than load the entire payload into memory first (since metrics are lexically ordered and process_start_time_seconds starts with a p and is therefore late in the payload.
Does this PR introduce a user-facing change?
Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.: