Tools such as the Prometheus expression browser can provide an easy way to execute queries and interact with Prometheus data. However, Prometheus also provides an HTTP API that can allow you to integrate Prometheus with your own custom tools. In this lesson, you will perform some simple queries using the Prometheus HTTP API, allowing you to gain hands-on experience with using that API.
Successfully complete this lab by achieving the following learning objectives:
- Get the Current Number of Threads
Log in to the Prometheus server.
Make an HTTP request to the Prometheus server to retrieve the data and save it to a file:
curl localhost:9090/api/v1/query?query=num_threads > /home/cloud_user/num_threads.txt
If you want, you can view the file to verify the output is there:
- Get the `num_threads` Data Over the Last Five Minutes
Make an HTTP request to retrieve the data and save it to a file:
start=$(date --date '-5 min' +'%Y-%m-%dT%H:%M:%SZ')
curl "localhost:9090/api/v1/query_range?query=num_threads&start=$start&end=$end&step=15s" > /home/cloud_user/num_threads_5_minutes.txt
View the file to verify the output is there.