[STAC-22427]: update extra_headers to clarify type and substitution opts#1592

VioletCranberry merged 1 commit intosuse-observabilityStackVista/stackstate-docs:suse-observabilityfrom

STAC-22427-enable-metrics-docs-fixStackVista/stackstate-docs:STAC-22427-enable-metrics-docs-fixCopy head branch name to clipboard