controller: requeue periodically to detect DNS drift#70
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Reconcile never returned RequeueAfter on success, so the operator only
revisited an ExternalDNS when its Source / Secret / CR changed. Drift
introduced outside the operator (manual provider edits, TTL-driven
cache turnover) was invisible until the next external event.
Add a ReconcileInterval field on the reconciler, default 5m, exposed
via --reconcile-interval. Both success exits now return
{RequeueAfter: r.ReconcileInterval}. Setting the flag to 0 keeps the
old event-only behavior.
Signed-off-by: Tamal Saha <tamal@appscode.com>
![kodiakhq[bot]](https://avatars.githubusercontent.com/in/29196?s=60&v=4){kind=small}
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Summary
The reconciler never returned `RequeueAfter` on success, so it only revisited an ExternalDNS when its Source / Secret / CR changed. Drift introduced outside the operator (manual provider edits, TTL turnover) stayed invisible until the next event.
Test plan