sonic-buildimage/dockers/docker-snmp/base_image_files/monit_snmp

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## Monit configuration for snmp container
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check program container_memory_snmp with path "/usr/bin/memory_checker snmp 4294967296"
    if status == 3 for 10 times within 20 cycles then exec "/usr/bin/docker exec snmp supervisorctl restart snmp-subagent"
Add monit_snmp file to monitor memory usage (#14464) #### Why I did it When CPU is busy, the sonic_ax_impl may not have sufficient speed to handle the notification message sent from REDIS. Thus, the message will keep stacking in the memory space of sonic_ax_impl. If the condition continues, the memory usage will keep increasing. #### How I did it Add a monit file to check if the SNMP container where sonic_ax_impl resides in use more than 4GB memory. If yes, restart the sonic_ax_impl process. #### How to verify it Run a lot of this command: `while true; do ret=$(redis-cli -n 0 set LLDP_ENTRY_TABLE:test1 test1); sleep 0.1; done;` And check the memory used by sonic_ax_impl keeps increasing. After a period, make sure the sonic_ax_impl is restarted when the memory usage reaches the 4GB threshold. And verify the memory usage of sonic_ax_impl drops down from 4GB. 2023-04-06 14:19:11 -05:00			`###############################################################################`
			`## Monit configuration for snmp container`
			`###############################################################################`
			`check program container_memory_snmp with path "/usr/bin/memory_checker snmp 4294967296"`
			`if status == 3 for 10 times within 20 cycles then exec "/usr/bin/docker exec snmp supervisorctl restart snmp-subagent"`