Harden production workflows and agent admission

agent/config.example.toml

@@ -1,4 +1,5 @@
-hostname = "example-host-01"
+# Optional. If omitted, the OS hostname is used as agent_id.
+# agent_id = "example-host-01"
 state_dir = "/var/lib/monlet-agent"
 
 [labels]
@@ -8,8 +9,7 @@ role = "api"
 [server]
 enabled = true
 url = "http://127.0.0.1:8000"
-token = "replace-me"
-heartbeat_interval = "30s"
+heartbeat_interval = "10s"
 batch_interval = "10s"
 
 [metrics]
@@ -24,3 +24,10 @@ command = '''
 '''
 interval = "60s"
 timeout = "10s"
+
+[[checks]]
+id = "uptime"
+name = "Uptime probe"
+command = "test $(cut -d. -f1 /proc/uptime) -gt 60"
+interval = "60s"
+timeout = "5s"