The A1 Policy Management Service Spring Boot application exposes some management endpoints including loggers, metrics, Prometheus, and so on...
All these endpoints are enabled by Spring Boot Actuator dependency. When this dependency is added in pom.xml, it will expose counters and statistics, which can then be managed from application.yaml.
(See London Montreal - Component configuration) for more details on configuration, and the application.yaml file)
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Prometheus Statistics
Prometheus is time-series database, which stores a sequence of data points, across time. It’s generally used to store metrics and performance data from your applications.
There are numerous predefined Prometheus statistics and counters, however we have added 3 new A1-specific metrics for the the A1 Policy Management Service:
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An example of Prometheus statistics:
Prometheus UI
If you want to collect and visualize Prometheus' statistics in Prometheus GUI, this can be configured in a 'prometheus.yml' Prometheus configuration file, similar to the example below.
This sample shows how Prometheus can periodically scrape the available metrics and make them available.
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# # ============LICENSE_START======================================================= # ONAP : ccsdk oran # ================================================================================ # Copyright (C) 2022-2023 Nordix Foundation. All rights reserved. # Copyright (C) 2023-2024 OpenInfra Foundation Europe. All rights reserved. # ================================================================================ # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # # SPDX-License-Identifier: Apache-2.0 # ============LICENSE_END========================================================= # # Sample Prometheus config # This assumes that your Prometheus instance can access this application on localhost:8081 # host.docker.internal could be overridden as per the application's end-point e.g. localhost global: scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute. evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute. # scrape_timeout is set to the global default (10s). scrape_configs: - job_name: 'A1 PMS scrape' metrics_path: '/actuator/prometheus' scrape_interval: 15s static_configs: - targets: ['host.docker.internal:8081'] |
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