OSConfigAgent error: unexpected end of JSON input

[Kamui123]

Hi,

Error from OSConfigAgent apears in gcp kubernetes cluster logs. It dosen't seem to have any consequances but i would like to know what it means and how to fix it.

{
  "insertId": "1trnnuben6xjv",
  "jsonPayload": {
    "localTimestamp": "2022-11-09T08:08:03.5535Z",
    "message": "unexpected end of JSON input",
    "omitempty": null
  },
  "resource": {
    "type": "gce_instance",
    "labels": {
      "instance_id": "1817953333370559090",
      "zone": "europe-west3-c",
      "project_id": "<project_id>"
    }
  },
  "timestamp": "2022-11-09T08:08:03.567235217Z",
  "severity": "ERROR",
  "labels": {
    "instance_name": "<instance_name>",
    "agent_version": "20210607.00"
  },
  "logName": "projects/<project_id>/logs/OSConfigAgent",
  "sourceLocation": {
    "file": "main.go",
    "line": "196",
    "function": "main.runTaskLoop"
  },
  "receiveTimestamp": "2022-11-09T08:08:04.913015193Z"
}

[khaledxmust]

I've the same error along with consequences, if you managed to solve it please contact me.

[arekkusu]

OSConfigAgent periodically contacts the Metadata server. The error message "unexpected end of JSON input" indicates there was an error when contacting the Metadata server and/or it returned unexpected data. In most cases the agent will simply reply on cached data and this will have no impact.

If this error occurs only infrequently (e.g. less than once per 24h per instance) then it's very likely to be temporary failure and does not indicate an actual issue with the instance or the OS Config Agent.

If it does happen frequently then it could indicate a more general issue with the VM / OS Config Agent not being able to contact the Metadata server. In that case this should be investigated further. If you have a support package please feel free to contact GCP support for assistance.