Bump Prometheus to 2019.2.23

Change-Id: Iaac0beb8e184196ee6f643791e0f27edf61d8cd9
Related-PROD: PROD-37070
diff --git a/defaults/docker_images.yml b/defaults/docker_images.yml
index 9234852..e835488 100644
--- a/defaults/docker_images.yml
+++ b/defaults/docker_images.yml
@@ -33,7 +33,7 @@
     # docker-prod-local.docker.mirantis.net/stacklight/sf-reporter:mcp-v0.1-nightly
     docker_image_prometheus_gainsight_tag: "2019.2.23"
     docker_image_prometheus_relay_tag: "2019.2.11"
-    docker_image_prometheus_tag: "2019.2.14"
+    docker_image_prometheus_tag: "2019.2.23"
     docker_image_pushgateway_tag: "2019.2.14"
     docker_image_registry_tag: "2019.2.6"
     # docker-kaas-local.artifactory.mirantis.com/stacklight/telegraf:v1.9.1-20210225142050