diff --git a/ansible/roles/cinder/templates/cinder.conf.j2 b/ansible/roles/cinder/templates/cinder.conf.j2
index f79145b017..e6272c979a 100644
--- a/ansible/roles/cinder/templates/cinder.conf.j2
+++ b/ansible/roles/cinder/templates/cinder.conf.j2
@@ -223,6 +223,9 @@ auth_endpoint = {{ keystone_internal_url }}
 {% if cinder_coordination_backend == 'redis' %}
 backend_url = {{ redis_connection_string }}
 {% elif cinder_coordination_backend == 'etcd' %}
-# NOTE(jeffrey4l): python-etcd3 module do not support multi endpoint here.
-backend_url = etcd3://{{ hostvars[groups['etcd'][0]]['ansible_' + hostvars[groups['etcd'][0]]['api_interface']]['ipv4']['address'] }}:{{ etcd_client_port }}
+# NOTE(yoctozepto): etcd-compatible tooz drivers do not support multiple endpoints here (verified in Stein, Train)
+# NOTE(yoctozepto): we must use etcd3gw (aka etcd3+http) due to issues with alternative (etcd3) and eventlet (as used by cinder)
+# see https://bugs.launchpad.net/kolla-ansible/+bug/1854932
+# and https://review.opendev.org/466098 for details
+backend_url = etcd3+http://{{ hostvars[groups['etcd'][0]]['ansible_' + hostvars[groups['etcd'][0]]['api_interface']]['ipv4']['address'] }}:{{ etcd_client_port }}
 {% endif %}
diff --git a/ansible/roles/designate/templates/designate.conf.j2 b/ansible/roles/designate/templates/designate.conf.j2
index 909ae013c6..c5c32af5fd 100644
--- a/ansible/roles/designate/templates/designate.conf.j2
+++ b/ansible/roles/designate/templates/designate.conf.j2
@@ -116,6 +116,9 @@ policy_file = {{ designate_policy_file }}
 {% if designate_coordination_backend == 'redis' %}
 backend_url = {{ redis_connection_string }}
 {% elif designate_coordination_backend == 'etcd' %}
-# NOTE(noxoid): python-etcd3 does not support multiple endpoints
-backend_url = etcd3://{{ hostvars[groups['etcd'][0]]['ansible_' + hostvars[groups['etcd'][0]]['api_interface']]['ipv4']['address'] }}:{{ etcd_client_port }}
+# NOTE(yoctozepto): etcd-compatible tooz drivers do not support multiple endpoints here (verified in Stein, Train)
+# NOTE(yoctozepto): we must use etcd3gw (aka etcd3+http) due to issues with alternative (etcd3) and eventlet (as used by designate)
+# see https://bugs.launchpad.net/kolla-ansible/+bug/1854932
+# and https://review.opendev.org/466098 for details
+backend_url = etcd3+http://{{ hostvars[groups['etcd'][0]]['ansible_' + hostvars[groups['etcd'][0]]['api_interface']]['ipv4']['address'] }}:{{ etcd_client_port }}
 {% endif %}
diff --git a/releasenotes/notes/coordination-backend-etcd3gw-8a58a2f5eddd1f57.yaml b/releasenotes/notes/coordination-backend-etcd3gw-8a58a2f5eddd1f57.yaml
new file mode 100644
index 0000000000..572b8a908b
--- /dev/null
+++ b/releasenotes/notes/coordination-backend-etcd3gw-8a58a2f5eddd1f57.yaml
@@ -0,0 +1,15 @@
+---
+fixes:
+  - |
+    When ``etcd`` is used with ``cinder_coordination_backend``
+    and/or ``designate_coordination_backend``, the config has been changed
+    to use the ``etcd3gw`` (aka ``etcd3+http``) ``tooz`` coordination driver
+    instead of ``etcd3`` due to issues with the latter's availability and
+    stability. ``etcd3`` does not handle well eventlet-based services,
+    such as cinder's and designate's.
+    See bugs `1852086
+    <https://bugs.launchpad.net/kolla-ansible/+bug/1852086>`__ and `1854932
+    <https://bugs.launchpad.net/kolla-ansible/+bug/1854932>`__
+    for details.
+    See also `tooz change introducing etcd3gw
+    <https://review.opendev.org/466098>`__.