Logging conventions

etcd uses the library for logging application output categorized into levels. A log message’s level is determined according to these conventions:

• • Examples:
    • A failure to allocate disk space for WAL

• Warning: (Hopefully) Temporary conditions that may cause errors, but may work fine. A replica disappearing (that may reconnect) is a warning.

  • Examples:
    • Failure to receive heartbeat message within the configured election timeout
• • Examples:
    • Add a new node into the cluster
    • Add a new user into auth subsystem
• • Examples:
    • Write a log entry to disk