ref: bring back single node docs

Author: aldy505

develop-docs/self-hosted/reference-architecture/simple-single-box.mdx

@@ -0,0 +1,28 @@
+---
+title: Simple Single Node
+sidebar_title: Simple Single Node
+sidebar_order: 1
+---
+
+This is the simplest setup for self-hosted Sentry. It is recommended for small to medium-sized installations. This setup follows [the minimum requirements](/self-hosted/#required-minimum-system-resources) for running Sentry.
+
+It is highly recommended to put an external load balancer (or reverse proxy) in front of your self-hosted Sentry deployment. That way, you can tweak on rate limiting, TLS termination, and other features that does not change the built-in nginx configuration file. It is recommended to install the load balancer on your host machine instead of as a Docker container. Doing this way helps you in the event of Docker engine failure.
+
+If using external load balancer is not possible, you can put it as a Docker container, pointing to the `nginx` service at port `80`. Whatever value you put on your `SENTRY_BIND` environment variable won't matter.
+
+```mermaid
+graph TB
+  subgraph Server
+    direction TB
+    nginx[External Nginx]
+    sentry[Self-Hosted Sentry]
+
+    nginx --> sentry
+  end
+
+  internet[Public Internet]
+
+  internet--> Server
+```
+
+For more information regarding configuring your external load balancer, please refer to the [External Load Balancer](/self-hosted/experimental/reverse-proxy/) section.