docs: Document safe concurrent processing of sidecar CMP (#10336)

Signed-off-by: jsmcnair <john.mcnair@yellowdog.co> Signed-off-by: jsmcnair <john.mcnair@yellowdog.co>
argoproj · Aug 15, 2022 · e25f21e · e25f21e
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diff --git a/docs/operator-manual/high_availability.md b/docs/operator-manual/high_availability.md
@@ -119,7 +119,7 @@ If the manifest generation has no side effects then requests are processed in pa
   * **Multiple Helm based applications pointing to the same directory in one Git repository:** ensure that your Helm chart don't have conditional
 [dependencies](https://helm.sh/docs/chart_best_practices/dependencies/#conditions-and-tags) and create `.argocd-allow-concurrency` file in chart directory.
 
-  * **Multiple Custom plugin based applications:** avoid creating temporal files during manifest generation and create `.argocd-allow-concurrency` file in app directory.
+  * **Multiple Custom plugin based applications:** avoid creating temporal files during manifest generation and create `.argocd-allow-concurrency` file in app directory, or use the sidecar plugin option, which processes each application using a temporary copy of the repository.
 
   * **Multiple Kustomize applications in same repository with [parameter overrides](../user-guide/parameters.md):** sorry, no workaround for now.
 

diff --git a/docs/user-guide/config-management-plugins.md b/docs/user-guide/config-management-plugins.md
@@ -14,7 +14,7 @@ There are two ways to install a Config Management Plugin (CMP):
 1. Add the plugin config to the Argo CD ConfigMap. The repo-server container will run your plugin's commands.
    This is a good option for a simple plugin that requires only a few lines of code that fit nicely in the Argo CD ConfigMap.
 2. Add the plugin as a sidecar to the repo-server Pod.
-   This is a good option for a more complex plugin that would clutter the Argo CD ConfigMap.
+   This is a good option for a more complex plugin that would clutter the Argo CD ConfigMap. A copy of the repository is sent to the sidecar container as a tarball and processed individually per application, which makes it a good option for [concurrent processing of monorepos](../operator-manual/high_availability.md#enable-concurrent-processing).
 
 ### Option 1: Configure plugins via Argo CD configmap