Expose recent log messages over NETCONF/RESTCONF

[troglobit]

Description

Expose recent log messages over NETCONF/RESTCONF, replacing cat /var/log/... over SSH in the test system.

The upcoming sysklogd 3.0 adds a membuf ring buffer and logread. Model an RPC, or operational data under /syslog, returning the last N entries with the RFC 5424 fields split out (timestamp, severity, facility, app-name, msgid, structured-data, message), filterable by msgid and app-name.

Additional Information

• Possibly the read half of the log-marker work in Add RPC for injecting log messages to a device #1639: a test injects msgid=test-start, then reads back everything since
• Should be designed together with the planned log streaming from DUTs to the test server, so the two share one message model
• Depends on enabling membuf in the Infix syslog config

General Information

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Please use this issue for discussions related to the feature.