Rework DockerServiceMonitoring* alerts

Fixes PROD-33667

Change-Id: Id34dba59e6a0d0eef41e680d8c526ddb96ff8fd9
diff --git a/tests/test-requirements.txt b/tests/test-requirements.txt
index 7188b2b..bc7dc7f 100644
--- a/tests/test-requirements.txt
+++ b/tests/test-requirements.txt
@@ -1,3 +1,4 @@
 jsonschema
 reno
 setuptools<45.0.0
+msgpack<1.0.0