This edge release features the option to persist prometheus data to a volume instead of memory, so that historical metrics are available when prometheus is restarted. Additional changes are outlined in the bullet points below. * Some commands like `linkerd stat` would fail if any control plane components were unhealthy, even when other replicas are healthy. The check conditions for these commands have been improved * The helm chart can now configure persistent storage for Prometheus (thanks @naseemkullah!) * The proxy log output format can now be configured to `plain` or `json` using the `config.linkerd.io/proxy-log-format` annotation or the `global.proxy.logFormat` value in the helm chart (thanks again @naseemkullah!) * `linkerd install --addon-config=` now supports URLs in addition to local files * The CNI Helm chart used the incorrect variable name to determine the `createdBy` version tag. This is now controlled by `cniPluginVersion` in the helm chart * The proxy's default buffer size has been increased, which reduces latency when the proxy has many concurrent clients