Closed as not planned
Description
Hi all. When I switched to spring boot from version 2.2.13.RELEASE to version 3.1.2, there was a problem with the metrics.
application.yml:
management:
endpoint:
health:
show-details: "ALWAYS"
endpoint:
metrics:
enabled: true
prometheus:
enabled: true
endpoints:
web:
exposure:
include: "*"
metrics:
export:
prometheus:
enabled: trueNamely, in some metrics, the UNKNOWN status appeared. Although in fact all requests were successful and should have a status of 200:
http_server_requests_seconds_count{error="none",exception="none",method="GET",outcome="SUCCESS",status="200",uri="/actuator/prometheus",} 9993.0
http_server_requests_seconds_sum{error="none",exception="none",method="GET",outcome="SUCCESS",status="200",uri="/actuator/prometheus",} 80.860505828
http_server_requests_seconds_count{error="none",exception="none",method="GET",outcome="UNKNOWN",status="UNKNOWN",uri="/actuator/prometheus",} 10.0
http_server_requests_seconds_sum{error="none",exception="none",method="GET",outcome="UNKNOWN",status="UNKNOWN",uri="/actuator/prometheus",} 0.170536004This can be easily reproduced by sending 1000 parallel requests to the /actuator/prometheus endpoint:
public static void main(String[] args) {
int numThreads = 10;
int numRequestsPerThread = 1000;
ExecutorService executorService = Executors.newFixedThreadPool(numThreads);
HttpClient httpClient = HttpClient.newHttpClient();
for (int i = 0; i < numThreads; i++) {
executorService.submit(() -> {
for (int j = 0; j < numRequestsPerThread; j++) {
sendHttpRequest(httpClient, "http://localhost:8080/actuator/prometheus");
}
});
}
executorService.shutdown();
}
private static void sendHttpRequest(HttpClient httpClient, String url) {
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create(url))
.GET()
.build();
try {
HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
if (response.statusCode() != 200) {
System.out.println("Response Code: " + response.statusCode());
}
} catch (Exception e) {
e.printStackTrace();
}
}What could be causing this problem and how to fix it? Thank you!