feat: add metrics for number of editing users (#730)

services/appflowy-collaborate/src/group/state.rs

@@ -135,16 +135,29 @@ impl GroupManagementState {
       object_id: object_id.to_string(),
     };
 
-    self
-      .editing_by_user
-      .entry(user.clone())
-      .or_default()
-      .insert(editing);
+    let entry = self.editing_by_user.entry(user.clone());
+    match entry {
+      dashmap::mapref::entry::Entry::Occupied(_) => {},
+      dashmap::mapref::entry::Entry::Vacant(_) => {
+        self
+          .metrics_calculate
+          .num_of_editing_users
+          .fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+      },
+    }
+
+    entry.or_default().insert(editing);
     Ok(())
   }
 
   pub(crate) async fn remove_user(&self, user: &RealtimeUser) {
     let entry = self.editing_by_user.remove(user);
+    if entry.is_some() {
+      self
+        .metrics_calculate
+        .num_of_editing_users
+        .fetch_sub(1, std::sync::atomic::Ordering::Relaxed);
+    }
     if let Some(editing_objects) = entry.map(|(_, e)| e) {
       for editing in editing_objects {
         match self.group_by_object_id.try_get(&editing.object_id) {

services/appflowy-collaborate/src/metrics.rs

@@ -12,6 +12,7 @@ pub struct CollabRealtimeMetrics {
   total_success_get_encode_collab_from_redis: Gauge,
   total_attempt_get_encode_collab_from_redis: Gauge,
   opening_collab_count: Gauge,
+  num_of_editing_users: Gauge,
   /// The number of apply update
   apply_update_count: Gauge,
   /// The number of apply update failed
@@ -27,6 +28,7 @@ impl CollabRealtimeMetrics {
       total_success_get_encode_collab_from_redis: Gauge::default(),
       total_attempt_get_encode_collab_from_redis: Gauge::default(),
       opening_collab_count: Gauge::default(),
+      num_of_editing_users: Gauge::default(),
       apply_update_count: Default::default(),
       apply_update_failed_count: Default::default(),
       acquire_collab_lock_count: Default::default(),
@@ -57,6 +59,11 @@ impl CollabRealtimeMetrics {
       "number of opening collabs",
       metrics.opening_collab_count.clone(),
     );
+    realtime_registry.register(
+      "editing_users_count",
+      "number of editing users",
+      metrics.num_of_editing_users.clone(),
+    );
     realtime_registry.register(
       "apply_update_count",
       "number of apply update",
@@ -91,6 +98,7 @@ pub(crate) struct CollabMetricsCalculate {
   pub(crate) apply_update_count: Arc<AtomicI64>,
   pub(crate) apply_update_failed_count: Arc<AtomicI64>,
   pub(crate) num_of_active_collab: Arc<AtomicI64>,
+  pub(crate) num_of_editing_users: Arc<AtomicI64>,
 }
 
 pub(crate) fn spawn_metrics<S>(
@@ -115,6 +123,13 @@ pub(crate) fn spawn_metrics<S>(
           .load(std::sync::atomic::Ordering::Relaxed),
       );
 
+      // editing users
+      metrics.num_of_editing_users.set(
+        metrics_calculation
+          .num_of_editing_users
+          .load(std::sync::atomic::Ordering::Relaxed),
+      );
+
       // connect user
       metrics.connected_users.set(
         metrics_calculation