We are observing the below logs under syslog:
> show log messages | match telnet
telnet from X.X.X.X exceeded counts/min (limit 5/min)
These logs are due to the following configuration under system services:
telnet { connection-limit 10; rate-limit 5; }
This is expected. rate-limit, which allows you to set a maximum number of connections per minute (1..250). Connections exceeding this limit are rejected and we will see these logs every time this happens.