fix(telemetry): restore worker agent delivery and truthful system status

deploy/telemetry-plane/telegraf/mission-core-linux.conf.tmpl

@@ -1,5 +1,8 @@
 [agent]
   interval = "${MISSIONCORE_TELEMETRY_INTERVAL}"
+  flush_interval = "${MISSIONCORE_TELEMETRY_INTERVAL}"
+  metric_batch_size = 200
+  metric_buffer_limit = 2000
   round_interval = true
   omit_hostname = false
 
@@ -26,6 +29,7 @@
   total = true
 
 [[outputs.mqtt]]
+  startup_error_behavior = "retry"
   servers = ["tcp://${MISSIONCORE_MQTT_HOST}:${MISSIONCORE_MQTT_PORT}"]
   topic = "mission-core/v1/contours/${MISSIONCORE_CONTOUR_ID}/agents/${MISSIONCORE_AGENT_ID}/host"
   username = "${MISSIONCORE_MQTT_USERNAME}"