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Advisor Alerts

The Advisor is an entity in Scylla Monitoring that aims to find potential users' problems and advise on how to solve them. It uses low-priority alerts as a notification method. That means that for each potential issue, it will generate an alert.

Following is a list of such alerts, with their description break into sections.

CQL Optimization

  • cqlNonPrepared: Some queries are non-prepared
  • cqlNonPaged: Some SELECT queries are non-paged
  • cqlNoTokenAware: Some queries are not token-aware
  • cqlReverseOrder: Some queries use reverse order
  • cqlAllowFiltering: Some queries use ALLOW FILTERING
  • cqlCLAny: Some queries use Consistency Level: ANY
  • cqlCLAll: Some queries use Consistency Level: ALL

Advisor alert for significant imbalance between elements in the cluster

  • nonBalancedcqlTraffic: CQL queries are not balanced among shards

Advisor alert for selected errors in the cluster

  • nodeLocalErrors: Some operation failed at the replica side
  • nodeIOErrors: IO Errors can indicate a node with a faulty disk
  • nodeCLErrors: Some operation failed due to consistency level

Log Based Alerts

It is possible to create an alert baesed on Loki, the alert can contain the text of the alert. - largeEntry: A large cell, row or partition found, text is taken from the trace line.