Merge pull request #14943 from ahardin-rh/4-1-add-known-issues

Added to known issues for 4.1

release_notes/ocp-4-1-release-notes.adoc

@@ -822,6 +822,23 @@ when shipped.
 * Unsafe sysctl cannot be used in {product-title} 4.1.
 (link:https://bugzilla.redhat.com/show_bug.cgi?id=1690754[*BZ#1690754*])
 
+* There is an issue in adding finalizers of machine-controller, which can cause
+instances to be leaked during `delete()` operations.  If a call to the cloud
+provider/actuator `Delete()`` function returns an error, since finalizers might
+not be applied, the machine-object will be deleted. Since the `Delete()` error
+could result in not being able to delete the actual instance from the cloud
+provider (such as api-quota limits), the instance will survive the
+machine-object deletion, and there will no longer be accounting of the instance.
+(link:https://bugzilla.redhat.com/show_bug.cgi?id=1712056[*BZ#1712056*])
+
+* If an instance is removed from the cloud provider (either via a user deletion,
+or cloud-provider event of some kind), and the machine-object is reconciled
+again for some reason, the machine-controller might determine the instance no
+longer exists and attempt to create the instance. This is undocumented behavior
+and should not be relied upon for workflows. This operation might interfere with
+current or future components, such as the node-health-checker.
+(link:https://bugzilla.redhat.com/show_bug.cgi?id=1712068[*BZ#1712068*])
+
 [[ocp-4-1-asynchronous-errata-updates]]
 == Asynchronous errata updates