Error in ossec log about too many events

[6mile]

I just connected a new agent to my SIPServer and I'm seeing this error in the SIPServer ossec log at /var/ossec/logs/ossec.log:

2018/04/10 16:20:04 ossec-agent: WARNING: Agent buffer at 90 %.
2018/04/10 16:20:07 ossec-agent: WARNING: Agent buffer is full: Events may be lost.
2018/04/10 16:20:22 ossec-agent: WARNING: Agent buffer is flooded: Producing too many events.

What does this mean?

[6mile]

You will have to increase your ulimit by running at the command line:
ulimit -n 10000

Additionally, you should tell the SIPServer to increase its events per second value in /var/ossec/etc/shared/agent.conf on the SIPServer.
Change this line:
<events_per_second>1000</events_per_second>
to this:
<events_per_second>1000</events_per_second>

...and then restart the agent on the server AND the client:
/var/ossec/bin/ossec-control restart