docs: add upgrade observability checklist#1144
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Adds a new page covering metrics to monitor during and after a Pulsar cluster upgrade, including: - Pre-upgrade baseline guidance - Per-component metrics to watch (ZooKeeper, BookKeeper, brokers, proxies) - Post-upgrade validation checklist - Rollback decision criteria Closes: N/A
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Motivation
There is currently no documentation covering what operators should monitor during and after a Pulsar cluster upgrade. This gap means teams either rely on tribal knowledge or discover issues after they've impacted production traffic.
Changes
Adds a new page
administration-upgrade-observability.mdwith:The page is added to the sidebar under the existing Administration section, immediately after the Upgrade Guide.
Verifying this change
The new page renders correctly and links to the existing Upgrade Guide, Monitoring, and Reference Metrics pages.
Related discussion: Apache Pulsar Slack – #dev, May 2026