Merge pull request #19854 from scogle/patch-1

Adds documentation on prometheus-ha cluster limit NRIE

Author: WriteMayur

src/content/docs/infrastructure/prometheus-integrations/install-configure/prometheus-high-availability-ha.mdx

@@ -68,7 +68,9 @@ New Relic requires two external labels to deduplicate data from replicas in a hi
   </tbody>
 </table>
 
-The remaining sections explain how labels work with Prometheus Operator and standalone Prometheus.
+<Callout variant="caution">
+  An account can have up to 1,500 unique Prometheus HA clusters. If this limit is exceeded, data from additional HA clusters will be dropped. In such cases, New Relic generates `PrometheusHAClusterLimit` [`NrIntegrationError`](https://docs.newrelic.com/docs/data-apis/ingest-apis/metric-api/troubleshoot-nrintegrationerror-events/) events.
+</Callout>
 
 ## Prometheus Operator [#kubernetes-operator]