diff --git a/manifests/api.pp b/manifests/api.pp
index 125c1dd3..7a253c45 100644
--- a/manifests/api.pp
+++ b/manifests/api.pp
@@ -62,6 +62,8 @@ class ceilometer::api (
   include ::ceilometer::params
   include ::ceilometer::policy
 
+  warning('ceilometer-api has been deprecated in Ocata and will be removed in future. Please use Aodh, Gnocchi and Panko modules instead.')
+
   if $auth_strategy == 'keystone' {
     include ::ceilometer::keystone::authtoken
   }
diff --git a/releasenotes/notes/warn-deprecated-ceilometer-api-77c2744e31644c5e.yaml b/releasenotes/notes/warn-deprecated-ceilometer-api-77c2744e31644c5e.yaml
new file mode 100644
index 00000000..f6132e9e
--- /dev/null
+++ b/releasenotes/notes/warn-deprecated-ceilometer-api-77c2744e31644c5e.yaml
@@ -0,0 +1,4 @@
+---
+deprecations:
+  - ceilometer API has been deprecated in Ocata. Warning the user
+    when ceilometer::api class is loaded.