monitoring: global: implement

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

Change-Id: Ib03003213d79b41cc54efe40cd2c4837f652c0f4
diff --git a/ops/monitoring/secrets/cipher/global-agent-cluster-k0 b/ops/monitoring/secrets/cipher/global-agent-cluster-k0
new file mode 100644
index 0000000..29e715b
--- /dev/null
+++ b/ops/monitoring/secrets/cipher/global-agent-cluster-k0
@@ -0,0 +1,40 @@
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