diff --git a/cloudkitty/api/v1/controllers/collector.py b/cloudkitty/api/v1/controllers/collector.py
index a138bfbc..a4ef0316 100644
--- a/cloudkitty/api/v1/controllers/collector.py
+++ b/cloudkitty/api/v1/controllers/collector.py
@@ -15,6 +15,7 @@
 #
 # @author: Stéphane Albert
 #
+from oslo_log import log as logging
 import pecan
 from pecan import rest
 import six
@@ -25,6 +26,8 @@ from cloudkitty.api.v1.datamodels import collector as collector_models
 from cloudkitty.common import policy
 from cloudkitty.db import api as db_api
 
+LOG = logging.getLogger(__name__)
+
 
 class MappingController(rest.RestController):
     """REST Controller managing service to collector mappings."""
@@ -39,6 +42,7 @@ class MappingController(rest.RestController):
 
         :param service: Name of the service to filter on.
         """
+        LOG.warning("Collector mappings are deprecated and shouldn't be used.")
         policy.authorize(pecan.request.context, 'collector:get_mapping', {})
         try:
             mapping = self._db.get_mapping(service)
@@ -55,6 +59,7 @@ class MappingController(rest.RestController):
         :param collector: Filter on the collector name.
         :return: Service to collector mappings collection.
         """
+        LOG.warning("Collector mappings are deprecated and shouldn't be used.")
         policy.authorize(pecan.request.context, 'collector:list_mappings', {})
         mappings = [collector_models.ServiceToCollectorMapping(
             **mapping.as_dict())
@@ -71,6 +76,7 @@ class MappingController(rest.RestController):
         :param collector: Name of the collector to apply mapping on.
         :param service: Name of the service to apply mapping on.
         """
+        LOG.warning("Collector mappings are deprecated and shouldn't be used.")
         policy.authorize(pecan.request.context, 'collector:manage_mapping', {})
         new_mapping = self._db.set_mapping(service, collector)
         return collector_models.ServiceToCollectorMapping(
@@ -85,6 +91,7 @@ class MappingController(rest.RestController):
 
         :param service: Name of the service to filter on.
         """
+        LOG.warning("Collector mappings are deprecated and shouldn't be used.")
         policy.authorize(pecan.request.context, 'collector:manage_mapping', {})
         try:
             self._db.delete_mapping(service)
diff --git a/releasenotes/notes/deprecate-collector-mappings-5a69b31c8037fc01.yaml b/releasenotes/notes/deprecate-collector-mappings-5a69b31c8037fc01.yaml
new file mode 100644
index 00000000..96b7b127
--- /dev/null
+++ b/releasenotes/notes/deprecate-collector-mappings-5a69b31c8037fc01.yaml
@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    Collector mappings have been deprecated and should not be used anymore. They
+    will be removed during OpenStack's S cycle.