Module io.helidon.webserver

Package io.helidon.webserver

Interface KeyPerformanceIndicatorSupport

public interface KeyPerformanceIndicatorSupport

Definitions and factory methods for key performance indicator KeyPerformanceIndicatorSupport.Context and KeyPerformanceIndicatorSupport.Metrics.

Helidon maintains two categories of KPI metrics:

1. basic - always collected (if the app depends on metrics) - count and meter of the number of arrived requests
2. extended - disabled by default, enabled using the MetricsSupport or JerseySupport builder or using config
   • concurrent gauge of in-flight requests
   • meters (rates) of
     • long-running requests
     • load (currently-running requests)
     • deferred requests

Helidon updates the KPI metrics in the MetricsSupport vendor metrics handler.

using a per-request KPI metrics context which it notifies when the request

1. arrives,
2. begins processing, and
3. completes processing.

The KPI metrics context implementation updates the appropriate KPI metrics as the request progresses through its processing.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	KeyPerformanceIndicatorSupport.Context	Per-request key performance indicator context, with behavior common to immediately-processed requests and deferrable ones.
static interface	KeyPerformanceIndicatorSupport.DeferrableRequestContext	Added per-request key performance indicator context behavior for requests for which processing might be deferred until some time after receipt of the request (i.e., some time after request handling begins).
static interface	KeyPerformanceIndicatorSupport.Metrics	Key performance indicator metrics behavior.