Add docs for ingress gateway dashboard

Author: ctauchen

calico-enterprise/observability/dashboards.mdx

@@ -59,3 +59,10 @@ The **Network Performance** dashboard provides TCP metrics to help you identify
 [Additional TCP statistics](elastic/flow/tcpstats.mdx) such as Round Trip Time, Retransmission and Packet Loss are not enabled by default, and must be configured.
 
 <Screenshot src="/img/calico-enterprise/dashboard-tcp-performance.png" alt="Network Performance Dashboard" />
+
+### Ingress Gateway L7
+
+The **Ingress Gateway L7** dashboard gives you a clear view of how your gateways are handling traffic and if they are set up correctly.
+It helps you track request speeds, find errors quickly, and make sure your apps stay connected and running well.
+
+<Screenshot src="/img/calico-enterprise/dashboard-ingress-gateway.png" alt="Ingress Gateway L7 dashboard" />