How to expose outbound metrics for prometheus for the webclient requests? - spring-webflux

Question

Hi I am quite new to prometheus metrics. I need to expose the http_client_requests_seconds_count and http_client_requests_seconds_sum for the requests to the down stream servers.
I have enabled the prometheus in my project by
management:
endpoints:
web:
exposure:
include: health,metrics,prometheus
I have added dependencies as below in my pom.xml
<dependency>
<groupId>io.micrometer</groupId>
<artifactId>micrometer-registry-prometheus</artifactId>
<version>${micrometer.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
and I can see the inbound matrix in http://localhost:8092/actuator/prometheus. Like http_server_requests_seconds and others but unable to find the downstream metrics.
I am using spring web-flux reactive framework.

Answer 1

As per this answer: stackoverflow.com/a/58632953 I tried it and found no luck.
The simple answer is just to add AutoWired to WeclientBuilder and build your Webclient out of it.
#Autowired
private WebClient.Builder webClientBuilder;
this.webClientBuilder.baseUrl(host)
.clientConnector(clientHttpConnector)
.build()
.post()
.uri(uri)...
Configure the metrics name in application.yml like below:
management:
metrics:
web:
client:
request:
autotime:
enabled: true
metric-name: Any_Prefix_http_client_requests
server:
request:
autotime:
enabled: true
metric-name: Any_Prefix_http_server_requests
That's it, you will get outbound metrics in /atuator/prometheus....
Thanks! Happy coding