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When looking at the rollout_lag metrics, I noticed that they sometimes jump from zero to several days and back to zero. I inspected this and it turned out that these apps are just becoming unhealthy and recover. In that case the rollout_lag should not go up again. In order to solve this, I added two more intermediate states to the rollout states.
progressing
( = change not applied yet ) is split up intoprogressing
( = argocd is working on it ) andpending
( = argocd has not picked it up yet )error
( = something failed ) is split up intoerror
( = sync failed ) andunhealthy
( = health is degraded )