Correctly initialise the `synapse_user_logins` metric. (#10677)

Fix a bug where the prometheus metrics for SSO logins wouldn't be initialised
until the first user logged in with a given auth provider.

1 files changed, 18 insertions, 0 deletions

diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 8cf614136e..0ed59d757b 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -56,6 +56,22 @@ login_counter = Counter(
 )
 
 
+def init_counters_for_auth_provider(auth_provider_id: str) -> None:
+    """Ensure the prometheus counters for the given auth provider are initialised
+
+    This fixes a problem where the counters are not reported for a given auth provider
+    until the user first logs in/registers.
+    """
+    for is_guest in (True, False):
+        login_counter.labels(guest=is_guest, auth_provider=auth_provider_id)
+        for shadow_banned in (True, False):
+            registration_counter.labels(
+                guest=is_guest,
+                shadow_banned=shadow_banned,
+                auth_provider=auth_provider_id,
+            )
+
+
 class LoginDict(TypedDict):
     device_id: str
     access_token: str
@@ -96,6 +112,8 @@ class RegistrationHandler(BaseHandler):
         self.session_lifetime = hs.config.session_lifetime
         self.access_token_lifetime = hs.config.access_token_lifetime
 
+        init_counters_for_auth_provider("")
+
     async def check_username(
         self,
         localpart: str,