diff --git a/guides/telemetry.md b/guides/telemetry.md
index cb119414..79058c67 100644
--- a/guides/telemetry.md
+++ b/guides/telemetry.md
@@ -75,5 +75,5 @@ Indicates when a coordinating event was raised, like a process being added for c
 ```erlang
 event_name: [amoc, coordinator, start | stop | add | reset | timeout]
 measurements: #{count => 1}
-metadata: #{name => atom()}
+metadata: #{monotonic_time => integer(), name => atom()}
 ```
diff --git a/src/amoc_coordinator/amoc_coordinator.erl b/src/amoc_coordinator/amoc_coordinator.erl
index 374c9379..63658044 100644
--- a/src/amoc_coordinator/amoc_coordinator.erl
+++ b/src/amoc_coordinator/amoc_coordinator.erl
@@ -74,7 +74,8 @@ start(Name, CoordinationPlan, Timeout) when ?IS_TIMEOUT(Timeout) ->
     Plan = normalize_coordination_plan(CoordinationPlan),
     case gen_event:start({local, Name}) of
         {ok, _} ->
-            telemetry:execute([amoc, coordinator, start], #{count => 1}, #{name => Name}),
+            telemetry:execute([amoc, coordinator, start], #{count => 1},
+                              #{monotonic_time => erlang:monotonic_time(), name => Name}),
             %% according to gen_event documentation:
             %%
             %%    When the event is received, the event manager calls
@@ -99,7 +100,8 @@ start(Name, CoordinationPlan, Timeout) when ?IS_TIMEOUT(Timeout) ->
 -spec stop(name()) -> ok.
 stop(Name) ->
     gen_event:stop(Name),
-    telemetry:execute([amoc, coordinator, stop], #{count => 1}, #{name => Name}).
+    telemetry:execute([amoc, coordinator, stop], #{count => 1},
+                      #{monotonic_time => erlang:monotonic_time(), name => Name}).
 
 %% @see add/3
 -spec add(name(), any()) -> ok.
@@ -163,8 +165,8 @@ handle_event(Event, {timeout, Name, Pid}) ->
                          reset_coordinator -> reset;
                          coordinator_timeout -> timeout
                      end,
-    telemetry:execute([amoc, coordinator, TelemetryEvent],
-                       #{count => 1}, #{name => Name}),
+    telemetry:execute([amoc, coordinator, TelemetryEvent], #{count => 1},
+                      #{monotonic_time => erlang:monotonic_time(), name => Name}),
     erlang:send(Pid, Event),
     {ok, {timeout, Name, Pid}};
 handle_event(Event, {worker, WorkerPid}) ->
diff --git a/test/amoc_coordinator_SUITE.erl b/test/amoc_coordinator_SUITE.erl
index 88dc3f57..90241755 100644
--- a/test/amoc_coordinator_SUITE.erl
+++ b/test/amoc_coordinator_SUITE.erl
@@ -327,9 +327,8 @@ assert_telemetry_events(Name, [{_Pid, Call, _Ret} | History], [Event | EventList
 assert_telemetry_handler_call(Name, Call, Event) ->
     EventName = [amoc, coordinator, Event],
     Measurements = #{count => 1},
-    EventMetadata = #{name => Name},
     HandlerConfig = ?TELEMETRY_HANDLER_CONFIG,
-    ExpectedHandlerCall = {?TELEMETRY_HANDLER, handler,
-                           [EventName, Measurements,
-                            EventMetadata, HandlerConfig]},
-    ?assertEqual(ExpectedHandlerCall, Call).
+    ?assertMatch(
+       {?TELEMETRY_HANDLER, handler,
+        [EventName, Measurements,
+         #{name := Name, monotonic_time := _}, HandlerConfig]}, Call).