What tools did you use for monitoring and log analysis in your previous job?

For monitoring and analyzing logs in my previous job, I used the ELK stack (Elasticsearch, Logstash, Kibana). Logs from different services were collected using Logstash or Filebeat, then indexed in Elasticsearch, which allowed for quick searching and aggregation of logs. Kibana was used for visualization and creating dashboards, helping to quickly identify errors and anomalies.

Prometheus was also used for collecting metrics, and Alertmanager for setting up alerts for critical events. In some cases, I used Grafana to unify metrics and logs in a single interface.

Example configuration of Filebeat for sending logs to Logstash:

filebeat.inputs:
- type: log
  paths:
    - /var/log/myapp/*.log

output.logstash:
  hosts: ["logstash.example.com:5044"]