OBSDOCS-1024: Write documentation for loadbalancer exporter component

Signed-off-by: Benedikt Bongartz <bongartz@klimlive.de>

modules/otel-collector-components.adoc

@@ -651,6 +651,46 @@ The Debug exporter prints traces and metrics to the standard output.
 ----
 <1> Verbosity of the debug export: `detailed` or `normal` or `basic`. When set to `detailed`, pipeline data is verbosely logged. Defaults to `normal`.
 
+[id="load-balancing-exporter_{context}"]
+=== Load Balancing Exporter
+
+The Load Balancing Exporter consistently exports spans, metrics, and logs according to the `routing_key` configuration.
+
+:FeatureName: The Load Balancing Exporter
+include::snippets/technology-preview.adoc[leveloffset=+1]
+
+.OpenTelemetry Collector custom resource with an enabled Load Balancing Exporter
+[source,yaml]
+----
+# ...
+  config: |
+    exporters:
+      loadbalancing:
+        routing_key: "service" # <1>
+        protocol:
+          otlp: # <2>
+            timeout: 1s
+        resolver: # <3>
+          static: # <4>
+            hostnames:
+            - backend-1:4317
+            - backend-2:4317
+          dns: # <5>
+            hostname: otelcol-headless.observability.svc.cluster.local
+          k8s: # <6>
+            service: lb-svc.kube-public
+            ports:
+              - 15317
+              - 16317
+# ...
+----
+<1> The `routing_key: service` exports spans for the same service name to the same Collector instance to provide accurate aggregation. The `routing_key: traceID` exports spans based on their `traceID`. The implicit default is `traceID` based routing.
+<2> The OTLP is the only supported load-balancing protocol. All options of the OTLP exporter are supported.
+<3> You can configure only one resolver.
+<4> The static resolver distributes the load across the listed endpoints.
+<5> You can use the DNS resolver only with a Kubernetes headless service.
+<6> The Kubernetes resolver is recommended.
+
 [id="prometheus-exporter_{context}"]
 === Prometheus exporter