docs(worker): add information about worker status and health (#4487)

* docs(worker): add information about worker status and health
---------
Co-authored-by: Dan Heath <76443935+Dan-Heath@users.noreply.github.com>

website/content/docs/concepts/workers.mdx

@@ -52,6 +52,14 @@ with tag “A,” to connect to targets in “Network A.”
 
 ![Boundary architecture example showing workers with tags](/img/worker-tags.png)
 
+## Status and health
+Boundary workers report their status to controllers on a regular basis. You can view the last time a worker reported its status in the
+admin UI as **Last Seen** and in the CLI as the **Last Status Time**. If a worker hasn't reported status recently, it can be an
+indication of an unhealthy worker.
+
+You can query the worker health endpoint to determine the health of a worker. The endpoint returns the worker state, active
+session count, and connection state of the worker. For more information, refer to the [health endpoints](/boundary/docs/operations/health) documentation.
+
 ## Multi-hop sessions
 
 <EnterpriseAlert product="boundary">This feature requires <a href="https://www.hashicorp.com/products/boundary">HCP Boundary or Boundary Enterprise</a></EnterpriseAlert>