Prometheus upgrades

Planning Prometheus version upgrades, from the 2.x to 3.x breaking changes to moving between long-term support lines.

Prometheus 2 to 3 upgrade

Upgrading from Prometheus 2.x to 3.x: the v2.55 stepping stone, scrape protocol failures from missing Content-Type headers, regex and le label changes that break queries, UTF-8 names and the Alertmanager v1 API removal.

Prometheus LTS 3.5 to 3.13 upgrade

Moving off the end-of-life 3.5 long-term support line to LTS 3.13: changes accumulated across the intermediate releases, testing rules and dashboards, and setting a yearly LTS upgrade rhythm.

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