added in note about egress proxies (FusionAuth#3421)

* added in note about egress proxies

astro/src/content/docs/get-started/download-and-install/system-requirements.mdx

@@ -115,7 +115,7 @@ Elasticsearch is optional, and may be leveraged for improving user search functi
 
 If you will be running Elasticsearch on the same host as FusionAuth, please ensure there is adequate RAM for both services to operate normally. Elasticsearch may also protect the index by moving it to read-only if the underlying host is running low on disk space, ensure you have plenty of free storage for the Elasticsearch index.
 
-You can use the [`fusionauth-search`](/docs/get-started/download-and-install/packages#fusionauth-search) package or any other Elasticsearch service including a cloud hosted service or just downloading it and installing it yourself from https://www.elastic.co/products/elasticsearch[elastic.co].
+You can use the [`fusionauth-search`](/docs/get-started/download-and-install/packages#fusionauth-search) package or any other Elasticsearch service including a cloud hosted service or just downloading it and installing it yourself from [elastic.co](https://www.elastic.co/products/elasticsearch).
 
 <ElasticsearchVersion />
 
@@ -149,6 +149,19 @@ If you are in a firewalled or restricted environment and have a paid plan, add t
 * `https://metrics.fusionauth.io`
 * `https://license.fusionauth.io`
 
+### Egress Proxies
+
+You may set up an outbound proxy and route required network connections through it. To use a proxy, set one or more of the following configuration parameters:
+
+* `proxy.host`
+* `proxy.port`
+* `proxy.username`
+* `proxy.password`
+
+When these are set, FusionAuth will use the configured proxy for all outbound connections.
+
+Learn more about [these parameters in the Configuration Reference](/docs/reference/configuration).
+
 ### Collected Metrics
 
 Currently FusionAuth sends a payload to the metrics endpoint for all instances.