Merge pull request #40009 from sounix000/update-pipelines-1.6.1-RN

Added known issue for Pipelines 1.6.1 RN

Author: Preeticp

modules/op-release-notes-1-6.adoc

@@ -251,7 +251,18 @@ time="2021-11-04T13:05:26Z" level=error msg="exit status 127"
 [id="release-notes-1-6-1_{context}"]
 == Release notes for {pipelines-title} General Availability 1.6.1
 
-The following improvements are made in {pipelines-title} 1.6.1:
+[id="known-issues-1-6-1_{context}"]
+=== Known issues
+
+* After upgrading to {pipelines-title} 1.6.1 from an older version, {pipelines-shortname} might enter an inconsistent state where you are unable to perform any operations (create/delete/apply) on Tekton resources (tasks and pipelines). For example, while deleting a resource, you might encounter the following error: 
++
+[source,terminal]
+----
+Error from server (InternalError): Internal error occurred: failed calling webhook "validation.webhook.pipeline.tekton.dev": Post "https://tekton-pipelines-webhook.openshift-pipelines.svc:443/resource-validation?timeout=10s": service "tekton-pipelines-webhook" not found.
+----
+
+[id="fixed-issues-1-6-1_{context}"]
+=== Fixed issues
 
 * The `SSL_CERT_DIR` environment variable (`/tekton-custom-certs`) set by {pipelines-title} will not override the following default system directories with certificate files:
 ** `/etc/pki/tls/certs`