fix: ensure both metrics are received

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: edgurgel

test/realtime/metrics_pusher_test.exs

@@ -48,17 +48,23 @@ defmodule Realtime.MetricsPusherTest do
         body = Req.Test.raw_body(conn)
         decompressed_body = :zlib.gunzip(body)
 
-        # Must have a tenant metric or a global metric
-        assert Regex.match?(~r/beam_stats_run_queue_count/, decompressed_body) or
-                 Regex.match?(~r/realtime_channel_input_bytes/, decompressed_body)
-
-        send(parent, :req_called)
+        # Collect decompressed bodies so we can assert that one has global metrics
+        # and the other has tenant metrics.
+        send(parent, {:req_called, decompressed_body})
         Req.Test.text(conn, "")
       end)
 
       {:ok, _pid} = start_and_allow_pusher(opts)
-      assert_receive :req_called, 100
-      assert_receive :req_called, 100
+
+      # Receive both request bodies
+      assert_receive {:req_called, body1}, 100
+      assert_receive {:req_called, body2}, 100
+
+      # One request must contain a global-only metric, the other a tenant-only metric.
+      assert (Regex.match?(~r/beam_stats_run_queue_count/, body1) and
+                Regex.match?(~r/realtime_channel_input_bytes.*tenant=/, body2)) or
+               (Regex.match?(~r/beam_stats_run_queue_count/, body2) and
+                  Regex.match?(~r/realtime_channel_input_bytes.*tenant=/, body1))
     end
 
     test "sends request successfully without auth header" do