enhancement(prometheus_remote_write sink): add support for healthcheck.uri (#24603)

* enhancement(prometheus_remote_write sink): add support for healthcheck.uri

* Add changelog entry

* Update prometheus_remote_write.cue

---------

Co-authored-by: simonhammes <simonhammes@users.noreply.github.com>

Author: simonhammes

changelog.d/24603_prometheus_remote_write_healthcheck_uri.enhancement.md

@@ -0,0 +1,3 @@
+The `prometheus_remote_write` sink now supports the `healthcheck.uri` field to customize the healthcheck endpoint.
+
+authors: simonhammes

src/sinks/prometheus/remote_write/config.rs

@@ -178,9 +178,14 @@ impl SinkConfig for RemoteWriteConfig {
             None => None,
         };
 
+        let healthcheck_endpoint = match cx.healthcheck.uri {
+            Some(uri) => uri.uri,
+            None => endpoint.clone(),
+        };
+
         let healthcheck = healthcheck(
             client.clone(),
-            endpoint.clone(),
+            healthcheck_endpoint,
             self.compression,
             auth.clone(),
         )

website/cue/reference/components/sinks/prometheus_remote_write.cue

@@ -15,7 +15,10 @@ components: sinks: prometheus_remote_write: {
 	features: {
 		auto_generated:   true
 		acknowledgements: true
-		healthcheck: enabled: true
+		healthcheck: {
+			enabled:  true
+			uses_uri: true
+		}
 		send: {
 			batch: {
 				enabled:      true