Juniper JunOS appliances can produce syslog event messages based on the following format.
[syslog header] TAG [junos@xxx key-value pairs] message-text
For a complete list of possible messages and the meaning of each, please refer to JunOS System Log Messages Reference
For a complete list of possible fields in each message, please refer to Juniper’s Syslog Explorer
Currently supported log IDs
FLOW_SESSION_CLOSE
FLOW_SESSION_DENY
FLOW_SESSION_CREATE
FLOW_REASSEMBLE_SUCCEED
FLOW_REASSEMBLE_FAIL
SSHD_LOGIN_FAILED
SSHD_LOGIN_ATTEMPTS_THRESHOLD