pg_exporter-v1.4.0

Changelog

• e216bcc bump go to 1.26.5
• 7c855da ci: add regular verification workflow
• b79a3db ci: verify generated configs, cancel stale runs, dedupe tests
• 0bd80df feat: add snapshot histogram collectors
• a1ab4d5 feat: replace pg_session with pg_xact_age collector
• ff39570 fix: align goreleaser version format and package metadata
• 7097f2d fix: close primary pool on fail-fast startup
• dd74186 fix: exempt timestamps and booleans from histogram scale
• 20489c0 fix: forward GOPROXY to docker build
• c51b0ba fix: preserve explicit exporter connection target
• 16b97b3 fix: reject non-canonical telemetry path and escape landing page
• c702a9a fix: set prometheus home and default database in packages
• 28da792 fix: validate and isolate HTTP routes
• b843800 refactor: unify histogram detection via Column.IsHistogram