diff --git a/internal/telemetry/testdata/expected_contains.golden b/internal/telemetry/testdata/expected_contains.golden
new file mode 100644
index 0000000..a1d1e59
--- /dev/null
+++ b/internal/telemetry/testdata/expected_contains.golden
@@ -0,0 +1,3 @@
+newt_connection_attempts_total
+newt_websocket_reconnects_total
+newt_proxy_connections_total