#Logging Fundamentals

Centralized logging best practices.

#Log Levels

Level	Use Case
DEBUG	Development info
INFO	Normal operations
WARN	Potential issues
ERROR	Failures
FATAL	Critical failures

#Structured Logging

json

1{
2  "timestamp": "2024-01-01T12:00:00Z",
3  "level": "error",
4  "message": "Connection failed",
5  "service": "api",
6  "request_id": "abc123",
7  "error": "timeout"
8}

#Log Aggregation Stack

diagram

[Apps] ──▶ [Agent] ──▶ [Aggregator] ──▶ [Storage] ──▶ [UI]
           Fluentd      Logstash         Elastic     Kibana
           Filebeat                      Loki        Grafana

[!TIP] Pro Tip: Always include correlation IDs in logs!