contour, cert-manager and external-secrets could not be compared or
synced:
error calculating structured merge diff: error building typed value
from live resource: .status.terminatingReplicas: field not declared
in schema
The ServerSideApply sync option makes Argo CD compute the diff locally
against a Kubernetes schema compiled into its own binary. Argo CD v2.13
is older than this cluster: GKE runs 1.35, and Deployments there carry
status.terminatingReplicas, which went beta and on-by-default in 1.33.
Argo CD's schema has never heard of the field, so the diff aborts before
any sync can happen. Nothing is wrong with the manifests, and only the
three apps using SSA are affected.
ServerSideDiff asks the API server to compute the diff via a dry-run
apply, so the schema in use is the cluster's own. Beta since v2.10 and
supported on the running version.
The generic chart could not express this — Application metadata had no
annotations block at all — so it gains an optional per-entry
compareOptions list rather than the annotation being hardcoded.
This is a workaround for an out-of-date Argo CD, not a fix. The fix is
upgrading to a build whose bundled schema matches the cluster; every
value key this repo relies on already exists in chart 10.8.4 (Argo CD
v3.5.2), so that upgrade is mostly a vendoring exercise plus the 3.0
breaking changes (logs RBAC now enforced, fine-grained RBAC inheritance,
resource tracking moving from labels to annotations).
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LEsTefWWifp4ikvhHF5s6N
