[Tooling update] health_checks

* Added:
- keystone fernet keys check
- keystone credential keys check

Prod-Related: PROD-31970
Change-Id: I5dd73e61fe8b44ecb725520874be06221b93a971
diff --git a/README.rst b/README.rst
index ba5e04b..84c1cf9 100644
--- a/README.rst
+++ b/README.rst
@@ -938,6 +938,19 @@
 
   salt -C 'I@opencontrail:compute' health_checks.libvirt_capabilities
 
+Check keystone fernet keys are in sync
+
+.. code-block:: bash
+
+  salt-call health_checks.keystone_keys_check
+  salt-call health_checks.keystone_keys_check keys_dir='/var/lib/keystone/fernet-keys'
+
+Check keystone credential keys are in sync
+
+.. code-block:: bash
+
+  salt-call health_checks.keystone_keys_check keys_type='credential'
+
 
 Encrypted pillars
 ~~~~~~~~~~~~~~~~~