Add a note about the agent status table limit of 10k records (#1428)

* Add note about agent status limited to 10k records

* Update docs/en/ingest-management/fleet/monitor-elastic-agent.asciidoc

* Update docs/en/ingest-management/fleet/monitor-elastic-agent.asciidoc

(cherry picked from commit f033fd7)

docs/en/ingest-management/fleet/monitor-elastic-agent.asciidoc

@@ -33,6 +33,9 @@ To view the overall status of your {fleet}-managed agents, in {kib}, go to
 [role="screenshot"]
 image::images/kibana-fleet-agents.png[Agents tab showing status of each {agent}]
 
+IMPORTANT: The **Agents** tab in **{fleet}** displays a maximum of 10,000 agents, shown on 500 pages with 20 rows per page.
+If you have more than 10,000 agents, we recommend using the filtering and sorting options described in this section to narrow the table to fewer than 10,000 rows.
+
 {agent}s can have the following statuses:
 
 |===
@@ -67,6 +70,10 @@ For advanced filtering, use the search bar to create structured queries
 using {kibana-ref}/kuery-query.html[{kib} Query Language]. For example, enter
 `local_metadata.os.family : "darwin"` to see only agents running on macOS.
 
+You can also sort the list of agents by host, last activity time, or version, by clicking on the table headings for those fields. 
+
+To perform a bulk action on more than 10,000 agents, you can select the **Select everything on all pages** button.
+
 [discrete]
 [[view-agent-details]]
 = View details for an agent