v3.31.0

Changelog

• 3b819cb v3.31.0
• 06110fa Fix minor typos in metric docs
• 4b5e025 chore(doc): add grafana panel
• 0a3dc43 chore(doc): add documentation for metrics
• a5bbc06 feat(metrics): add various new metrics
• c675324 Re-allow unspecified IPv6 local transport address