path: util/aop/aop-service/src/main/java/com/knubisoft/aop/service/MethodExecutionTimeAspect.java

MethodExecutionTimeAspect works on the service layer and collects metrics about how long it took to execute and process the business logic of a particular method for each of its invocations (sum/max).

For counting we use the Micrometer library and its Timer, for each method, the first time it is called, a Timer is created using the TimerFactory and performs execution time count, if the Timer for method already exists, TimerFactory will return an existing instead of creating a new one.

MethodExecutionTimeAspect annotated with @ConditionalOnProperty(value = "management.serviceLayerMetrics.methodExecutionTimeEnabled", havingValue = "true"), so to 'enable' this aspect you must set the property management.serviceLayerMetrics.methodExecutionTimeEnabled within the application.yaml to true.

Metrics we collect using Micrometer are also available for Prometheus (we create PrometheusMeterRegistry) and can be retrieved by the Spring Actuator endpoint your_host:your_port/actuator/prometheus

Method execution time metrics can be requested from Prometheus by name service_method_execution_time_seconds_sum and service_method_execution_time_seconds_max, as you can see in the screenshot, each method has its own metric with a related Java service method name.

For metrics visualization we use Graphana and a specific dashboard (path: ops/grafana/application-dashboard-v2.json) where exists the method execution time panel

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