Are there any specific Grok patterns for syslog logs

1. SYSLOG5424PRI: This pattern matches the priority part of a syslog message according to RFC 5424. It is often used at the beginning of a Grok pattern for syslog messages.

2. CISCOTIMESTAMP: This pattern is used to match timestamps in the format commonly used by Cisco devices, which is also seen in many syslog messages.

3. IPORHOST: This pattern matches either an IP address or a hostname, which is useful for identifying the source or destination hosts in syslog messages.

4. SYSLOGPROG: This pattern matches the program name that generated the syslog message.

Here's an example of a Grok pattern for a typical syslog message:

grok
match => [ "message", "%{SYSLOG5424PRI}%{CISCOTIMESTAMP:syslog_timestamp} %{IPORHOST:syslog_host}/%{IPORHOST:syslog_relayhost} %{SYSLOGPROG}: %{GREEDYDATA:syslog_message}" ]

This pattern extracts the priority, timestamp, host, relay host, program name, and the actual message from the syslog log[1][2].

For more complex or specific syslog formats, you might need to adjust or combine these patterns. Additionally, Grok allows you to define custom patterns if the standard ones do not fit your needs[2][8].