docs: Document "offload node status is not supported" error. (#7005)

Signed-off-by: Josh Carp <jm.carp@gmail.com>

docs/offloading-large-workflows.md

@@ -14,7 +14,17 @@ To enable this feature, configure a Postgres or MySQL database under `persistenc
 
 Offloading is expensive and often unneccessary, so we only offload when we need to. Your workflows aren't probably large enough.
 
-
 #### Error "Failed to submit workflow: etcdserver: request is too large."
 
 You must use the Argo CLI having exported `export ARGO_SERVER=...`.
+
+#### Error "offload node status is not supported"
+
+Even after compressing node statuses, the workflow exceeded the EtcD
+size limit. To resolve, either enable node status offload as described
+above or look for ways to reduce the size of your workflow manifest:
+
+- Use `withItems` or `withParams` to consolidate similar templates into a single parameterized template
+- Use [template defaults](https://argoproj.github.io/argo-workflows/template-defaults/) to factor shared template options to the workflow level
+- Use [workflow templates](https://argoproj.github.io/argo-workflows/workflow-templates/) to factor frequently-used templates into separate resources
+- Use [workflows of workflows](https://argoproj.github.io/argo-workflows/workflow-of-workflows/) to factor a large workflow into a workflow of smaller workflows