What logging systems have you worked with? How do you find the needed log piece? What logging levels do you know? Which level is higher - INFO or DEBUG?

Worked with various logging systems, including Python's standard logging module, Log4j in Java, as well as centralized systems like ELK (Elasticsearch, Logstash, Kibana) and Splunk.

To find the needed log segment, I usually used filtering by time, log level, keywords, or session/request identifiers. In centralized systems, I applied queries using regular expressions and filters.

Main log levels:

• DEBUG — detailed debugging information
• INFO — informational messages about normal operation
• WARNING — warnings about potential issues
• ERROR — errors that did not interrupt the program's operation
• CRITICAL — critical errors, often leading to shutdown

The INFO level is higher than DEBUG. DEBUG is the most detailed level, used for in-depth debugging, while INFO is for general messages about the process.