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Domain-level Frontend Metrics

Frontend Availability

Domain-level Frontend Availability Metrics group contains availability-related information about a specific domain as reported by the Cadence Frontend Service instance running on each node.

  • Frontend requests: This is the number of requests per second to Cadence Frontend Service in the specific domain.
  • Frontend Availability: This is the overall availability of the Cadence Frontend Service in the specific domain.
  • Frontend Internal Errors: This is the number of Internal Errors per second to Cadence Frontend Service in the specific domain.
  • Frontend Client Errors: This is the number of Client  Errors per second to Cadence Frontend Service in the specific domain.

Frontend Cadence Latency

Domain-level Frontend Cadence Latency Metrics group contains the latency information of regular core API (excluding long-poll) about a specific domain as reported by the Cadence Frontend Service instance running on each node.

  • Frontend Latency – 50th: This metric displays the average time taken in milliseconds by 50% of all APIs and operations in a specific domain.
  • Frontend Latency – 95th: This metric displays the average time taken in milliseconds by 95% of all APIs and operations. Recommend over 1500ms triggers a warning and over 2000ms triggers an alert.

Frontend Long-Poll Latency

Domain-level Frontend Cadence Latency Metrics group contains the latency information of long poll API about a specific domain as reported by the Cadence Frontend Service instance running on each node. 

There are two types of long poll in Cadence: poll for activity task and poll for decision task. It means that the worker is waiting for a task. A low Long-Poll Latency indicates that Cadence may need more workers.

  • Activity Task Poll Latency – 50th: This metric displays the average time taken in milliseconds by 50% of the poll for activity task APIs and operations.
  • Activity Task Poll Latency – 95th: This metric displays the average time taken in milliseconds by 95% of the poll for activity task APIs and operations.
  • Decision Task Poll Latency – 50th: This metric displays the average time taken in milliseconds by 50% of the poll for decision task APIs and operations.
  • Decision Task Poll Latency – 95th: This metric displays the average time taken in milliseconds by 95% of the poll for decision task APIs and operations.
By Instaclustr Support
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