diff --git a/cylc/flow/task_events_mgr.py b/cylc/flow/task_events_mgr.py
index 8e3ec3503cc..f1fd5138df0 100644
--- a/cylc/flow/task_events_mgr.py
+++ b/cylc/flow/task_events_mgr.py
@@ -463,7 +463,8 @@ def process_events(self, schd: 'Scheduler') -> None:
             if not timer.is_timeout_set():
                 if timer.next() is None:
                     LOG.warning(
-                        f"{point}/{name}/{submit_num:02d} {key1} failed"
+                        f"{point}/{name}/{submit_num:02d}"
+                        f" handler:{key1[0]} for task event:{key1[1]} failed"
                     )
                     self.remove_event_timer(id_key)
                     continue
@@ -471,13 +472,13 @@ def process_events(self, schd: 'Scheduler') -> None:
                 msg = None
                 if timer.num > 1:
                     msg = (
-                        f"{key1} failed, "
-                        f"retrying in {timer.delay_timeout_as_str()}"
+                        f"handler:{key1[0]} for task event:{key1[1]} failed,"
+                        f" retrying in {timer.delay_timeout_as_str()}"
                     )
                 elif timer.delay:
                     msg = (
-                        f"{key1} will run after "
-                        f"{timer.delay_timeout_as_str()}"
+                        f"handler:{key1[0]} for task event:{key1[1]} will"
+                        f" run after {timer.delay_timeout_as_str()}"
                     )
                 if msg:
                     LOG.debug(f"{point}/{name}/{submit_num:02d} {msg}")
diff --git a/tests/flakyfunctional/events/44-timeout.t b/tests/flakyfunctional/events/44-timeout.t
index 1b94f7626c5..19a9bc57a62 100755
--- a/tests/flakyfunctional/events/44-timeout.t
+++ b/tests/flakyfunctional/events/44-timeout.t
@@ -40,7 +40,7 @@ contains_ok 'log' <<__END__
 ERROR - [(('event-handler-00', 'started'), 1) cmd] sleeper.sh 1/foo
 ${LOG_INDENT}[(('event-handler-00', 'started'), 1) ret_code] -9
 ${LOG_INDENT}[(('event-handler-00', 'started'), 1) err] killed on timeout (PT10S)
-WARNING - 1/foo/01 ('event-handler-00', 'started') failed
+WARNING - 1/foo/01 handler:event-handler-00 for task event:started failed
 __END__
 
 cylc workflow-state "${WORKFLOW_NAME}" >'workflow-state.log'
diff --git a/tests/functional/events/10-task-event-job-logs-retrieve.t b/tests/functional/events/10-task-event-job-logs-retrieve.t
index 353f7fbe2ab..933a0e89387 100755
--- a/tests/functional/events/10-task-event-job-logs-retrieve.t
+++ b/tests/functional/events/10-task-event-job-logs-retrieve.t
@@ -50,11 +50,11 @@ cmp_ok 'edited-activities.log' <<'__LOG__'
 __LOG__
 
 grep -F 'will run after' "${WORKFLOW_RUN_DIR}/log/workflow/log" \
-    | cut -d' ' -f 4-10 | sort >"edited-log"
+    | cut -d' ' -f 4-12 | sort >"edited-log"
 cmp_ok 'edited-log' <<'__LOG__'
-1/t1/01 ('job-logs-retrieve', 'retry') will run after PT5S
-1/t1/02 ('job-logs-retrieve', 'retry') will run after PT5S
-1/t1/03 ('job-logs-retrieve', 'succeeded') will run after PT5S
+1/t1/01 handler:job-logs-retrieve for task event:retry will run after PT5S
+1/t1/02 handler:job-logs-retrieve for task event:retry will run after PT5S
+1/t1/03 handler:job-logs-retrieve for task event:succeeded will run after PT5S
 __LOG__
 
 purge