Yeti-cli output related issues

Dear all, I am having issue with some the output I receive from my server using the yeti-cli commands. See below:
yeti-cli:local> core.show.sessions.limit

| limit | limit_error_code | limit_error_reason |

| 0 | 503 | Server overload |

1 record. Took 0.0017 seconds

is this an issue of overload on the server or wrong configurations?

There are no issues.