[release-1.0] Address 503s when the autoscaler is being rolled #12623
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The activator's readiness depends on the status of web socket connection to the autoscaler. When the connection is down the activator will report ready=false. This can occur when the autoscaler deployment is updating. PR knative#12614 made the activator's readiness probe fail aggressively after a single failure. This didn't seem to impact istio but with contour it started returning 503s since the activator started to report ready=false immediately. This PR does two things to mitigate 503s: - bump the readiness threshold to give the autoscaler more time to rollout/startup. This still remains lower than the drain duration - Update the autoscaler rollout strategy so we spin up a new instance prior to bring down the older one. This is done using maxUnavailable=0
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: dprotaso, knative-prow-robot The full list of commands accepted by this bot can be found here. The pull request process is described here
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## release-1.0 #12623 +/- ##
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This is an automated cherry-pick of #12617