Doc additions and corrections.

Author: sigram

solr/solr-ref-guide/modules/deployment-guide/pages/cross-dc-replication.adoc

@@ -151,8 +151,9 @@ system property.
 
 Currently the following endpoints are exposed (on local port configured using `port` property, default is 8090):
 
-`/metrics` - (GET):: This endpoint returns JSON-formatted metrics describing various aspects of document processing in Consumer.
+`/metrics` - (GET):: This endpoint returns metrics in Prometheus text format, describing various aspects of document processing in Consumer.
 `/threads` - (GET):: Returns a plain-text thread dump of the JVM running the Consumer application.
+`/health` - (GET):: Returns an `HTTP 200 OK` code if the service is in a healthy state, or `HTTP 503 Service Unavailable` if one or more healthcheck probes failed. The JSON response body provides more details.
 
 ==== Configuration Properties for the CrossDC Manager: