What logging systems have you worked with?

In my work, I had to use several logging systems, including:

• ELK Stack (Elasticsearch, Logstash, Kibana) — for collecting, storing, and visualizing logs. It allows efficient searching and analyzing of large data volumes.
• Prometheus + Grafana — for monitoring and alerting, often used together with logs for comprehensive observation.
• Fluentd / Fluent Bit — for aggregating and routing logs from various sources.
• Syslog — a classic logging system in Unix-like systems.

Example of using ELK Stack:

# Logstash configuration for log intake
input {
  file {
    path => "/var/log/myapp/*.log"
    start_position => "beginning"
  }
}
output {
  elasticsearch {
    hosts => ["localhost:9200"]
  }
}

These tools enable centralized collection, storage, and analysis of logs, which is critical for service support and debugging.