Add metrics for tracking 3PID /requestToken requests. (#8712)

The main use case is to see how many requests are being made, and how
many are second/third/etc attempts. If there are large number of retries
then that likely indicates a delivery problem.

1 files changed, 9 insertions, 0 deletions

diff --git a/synapse/rest/client/v2_alpha/register.py b/synapse/rest/client/v2_alpha/register.py
index 8f2c8cd991..ea68114026 100644
--- a/synapse/rest/client/v2_alpha/register.py
+++ b/synapse/rest/client/v2_alpha/register.py
@@ -45,6 +45,7 @@ from synapse.http.servlet import (
     parse_json_object_from_request,
     parse_string,
 )
+from synapse.metrics import threepid_send_requests
 from synapse.push.mailer import Mailer
 from synapse.util.msisdn import phone_number_to_msisdn
 from synapse.util.ratelimitutils import FederationRateLimiter
@@ -163,6 +164,10 @@ class EmailRegisterRequestTokenRestServlet(RestServlet):
             # Wrap the session id in a JSON object
             ret = {"sid": sid}
 
+        threepid_send_requests.labels(type="email", reason="register").observe(
+            send_attempt
+        )
+
         return 200, ret
 
 
@@ -234,6 +239,10 @@ class MsisdnRegisterRequestTokenRestServlet(RestServlet):
             next_link,
         )
 
+        threepid_send_requests.labels(type="msisdn", reason="register").observe(
+            send_attempt
+        )
+
         return 200, ret