Prometheus端点中不提供使用Micrometer的自定义指标

Question

I'm using Micrometer in Java Spring Boot 1.5 application to scrape custom metrics for Prometheus.

I'm using "guageCollectionSize" method to count the number of entries in a HashMap. When I print the guage value, I'm getting the correct output as expected. But the problem is that I'm not able to view the custom metric in /prometheus endpoint.

Please find the code below

private Map<String, String> _strings;
private MeterRegistry registry;
_strings = new ConcurrentHashMap<String, String>();
_strings.put("Test","Test");
_strings.put("Test2","Test");
registry = new PrometheusMeterRegistry(PrometheusConfig.DEFAULT);

registry.gaugeCollectionSize("strings_count", Tags.empty(),_strings.keySet());
System.out.println(registry.get("strings_count").gauge().value());

Can someone please help me to fix this issue?

Answer 1

As I told you on the GitHub issue which you created on the project repository, you're creating your own PrometheusMeterRegistry but you should use the auto-configured one.

I created a sample that uses the auto-configured one and added a test for it.