Log Router & Sinks

The Log Router is the central routing engine in Cloud Logging. Every log entry that arrives in Cloud Logging passes through the Log Router, which evaluates inclusion and exclusion filters to determine where each entry should be stored. Sinks are the routing rules that direct log entries to specific destinations. Together, the Log Router and sinks give you fine-grained control over log storage, cost, and compliance.

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How the Log Router Works

Log entry arrives
        |
  Log Router evaluates all sinks
        |
  +-----------+-----------+-----------+
  |           |           |           |
_Required   _Default    Custom      Custom
  bucket      bucket    sink 1      sink 2
  (audit)   (general)  (BigQuery)  (Cloud Storage)

Key Principles