ops/monitoring: split up jsonnet, add simple docs

Change-Id: I8120958a6862411de0446896875766834457aba9
diff --git a/ops/monitoring/lib.libsonnet b/ops/monitoring/lib.libsonnet
new file mode 100644
index 0000000..61f49b4
--- /dev/null
+++ b/ops/monitoring/lib.libsonnet
@@ -0,0 +1,5 @@
+local cluster = import "lib/cluster.libsonnet";
+
+{
+    Cluster: cluster.Cluster,
+}