monitoring: global: implement

This creates a basic Global instance, running Victoria Metrics on k0.

Change-Id: Ib03003213d79b41cc54efe40cd2c4837f652c0f4
diff --git a/ops/monitoring/secrets/plain/.gitignore b/ops/monitoring/secrets/plain/.gitignore
new file mode 100644
index 0000000..72e8ffc
--- /dev/null
+++ b/ops/monitoring/secrets/plain/.gitignore
@@ -0,0 +1 @@
+*