prepare release v1.21.0

Author: ammolitor

docs/changelog/v1.21.0.md

@@ -0,0 +1,14 @@
+# v1.21.0
+
+## Changes
+
+### Operator
+
+* Remove logServersPerDisk from v1beta1 API [#1742](https://github.com/FoundationDB/fdb-kubernetes-operator/pull/1742)
+* Fix linting for status fields that are lists [#1737](https://github.com/FoundationDB/fdb-kubernetes-operator/pull/1737)
+* Explanation for the number of recoveries that happen during an upgrade [#1736](https://github.com/FoundationDB/fdb-kubernetes-operator/pull/1736)
+* Disable node access per default in the operator [#1735](https://github.com/FoundationDB/fdb-kubernetes-operator/pull/1735)
+* Document used FDB ports [#1733](https://github.com/FoundationDB/fdb-kubernetes-operator/pull/1733)
+* Correct the way how the client knobs are passed down and used [#1731](https://github.com/FoundationDB/fdb-kubernetes-operator/pull/1731)
+* Replacement logic should ignore process groups that are in maintenance mode [#1711](https://github.com/FoundationDB/fdb-kubernetes-operator/pull/1711)
+* supporting multiple Log processes per disk [#1686](https://github.com/FoundationDB/fdb-kubernetes-operator/pull/1686)