fix: prevent telemetry errors when Exq is not running

- Check if Exq process is running before attempting to collect metrics
- Change rescue to catch to handle process exits (:noproc)
- Prevents error logs in environments where Exq is not configured

lib/towerops_web/telemetry.ex

@@ -135,12 +135,9 @@ defmodule ToweropsWeb.Telemetry do
   Publishes Exq queue and process statistics.
   """
   def publish_exq_stats do
-    # Only run if Exq is available (not in test env)
-    if Application.get_env(:towerops, :env) == :test do
+    # Only run if Exq is available (not in test env) and the process is running
+    if Application.get_env(:towerops, :env) == :test or not Process.whereis(Exq) do
       :ok
-      # Get stats for each queue
-
-      # Get process stats
     else
       try do
         queues = ["default", "discovery", "polling", "monitoring", "maintenance"]
@@ -171,8 +168,9 @@ defmodule ToweropsWeb.Telemetry do
         )
 
         :ok
-      rescue
-        _ -> :ok
+      catch
+        # Catch exits (like :noproc) and exceptions
+        _, _ -> :ok
       end
     end
   end