diff --git a/octavia_tempest_plugin/common/constants.py b/octavia_tempest_plugin/common/constants.py
index 4d854f1..8ef8d94 100644
--- a/octavia_tempest_plugin/common/constants.py
+++ b/octavia_tempest_plugin/common/constants.py
@@ -131,6 +131,7 @@
 HTTP = 'HTTP'
 HTTPS = 'HTTPS'
 PROXY = 'PROXY'
+PROMETHEUS = 'PROMETHEUS'
 TCP = 'TCP'
 TERMINATED_HTTPS = 'TERMINATED_HTTPS'
 UDP = 'UDP'