flagger/docs/gitbook/dev/upgrade-guide.md

Upgrade Guide

This document describes how to upgrade Flagger.

Upgrade canaries v1alpha3 to v1beta1

Canary CRD changes in canaries.flagger.app/v1beta1:

• the spec.canaryAnalysis field has been deprecated and replaced with spec.analysis
• the spec.analysis.interval and spec.analysis.threshold fields are required
• the status.lastAppliedSpec and status.lastPromotedSpec hashing algorithm changed to hash/fnv
• the spec.analysis.alerts array can reference alertproviders.flagger.app/v1beta1 resources
• the spec.analysis.metrics[].templateRef can reference a metrictemplate.flagger.app/v1beta1 resource
• the metric.threshold field has been deprecated and replaced with metric.thresholdRange
• the spec.targetRef can reference DaemonSet kind

Upgrade procedure:

• install the v1beta1 CRDs
• update Flagger deployment
• replace apiVersion: flagger.app/v1alpha3 with apiVersion: flagger.app/v1beta1 in all canary manifests
• replace spec.canaryAnalysis with spec.analysis in all canary manifests
• update canary manifests in cluster

Note that after upgrading Flagger, all canaries will be triggered as the hash value used for tracking changes is computed differently. You can set spec.skipAnalysis: true in all canary manifests before upgrading Flagger, do the upgrade, wait for Flagger to finish the no-op promotions and finally set skipAnalysis to false.