Use debug! for routine events that occur frequently within the system.
Example:
debug!("View {} decided", view_number);Use info! for events that occur under specific conditions, which are not issues but might aid in debugging.
Example:
if missing_data {
info!("Fetching missing data for query {}", query_id);
}Use warn! for events that indicate a potential issue, which the system can handle, but might require human attention.
Example:
if message_loss_rate > threshold {
warn!("Increased message loss detected: {}", message_loss_rate);
}Use error! for critical issues that could lead to a permanent degradation of the system without manual intervention.
Example, we log an error when safety and liveness are violated:
if !safety_check && !liveness_check {
error!("Failed safety and liveness check \n High QC is {:?} Proposal QC is {:?} Locked view is {:?}", consensus.high_qc(), proposal.data.clone(), consensus.locked_view());
}