Harden production workflows and agent admission

deploy/showcase/agents/flap.toml

@@ -1,4 +1,4 @@
-hostname = "agent-flap"
+agent_id = "agent-03"
 state_dir = "/var/lib/monlet-agent"
 
 [labels]
@@ -8,7 +8,6 @@ role = "showcase"
 [server]
 enabled = true
 url = "http://server:8000"
-token = "monlet-dev-token"
 heartbeat_interval = "5s"
 batch_interval = "3s"
 
@@ -22,4 +21,4 @@ name = "Flapping check (oscillates ok/critical)"
 command = "/opt/monlet/checks/flap.sh"
 interval = "10s"
 timeout = "3s"
-dedupe_key = "agent-flap:flap"
+dedupe_key = "agent-03:flap"