spring-prometheus-grafana

For correct operation it is necessary to make some steps:

1- Run the command docker-compose up -d --build in the terminal:

2- Run the API:

Now, the containers are up. Prometheus is in localhost:9090 and grafana in localhost:3000. Can be configured to monitor the metrics.

Configuring prometheus in the grafana

1- Access localhost:3000 and use user: admin, password: admin

2- Click in Configuration -> Data Sources:

3- Select the "Prometheus" data source

4- Now, to configure Promteheus is necessary add URL = http://prometheus:9090 and to click in Save & Test:

Configuring metrics

1- First, lets generate some metrics, so access http://localhost:7000/{name-of-tag} how many times you want:

2- Counter metric. In Grafana add a new panel, select the type of visualization "Stat" and add the metric "spring_counter_http_request_total" in the fiel metrics browser, click in Apply, ready! The counter metric is configured:

3- Gauge metric. Add a new panel, select type of visualization "Gauge" and add the metric "spring_gauge_online_users", click in Apply, ready! The gauge metric is configured (important, this metric is generate with random value in the api):

4- Histogram metric. Add a new panel, select type of visualization "Graph" or other of your preference and add the metric "spring_histogram_request_durantion_count", click in Apply, ready! The histogram metric is configured:

5- Ready, the metrics are set and we can access localhost:7000/nameoftag to see the values changes in grafana:

OBS: These settings will NOT be saved.