Add note on resource constraints for OpenFaaS Edge

Signed-off-by: Han Verstraete (OpenFaaS Ltd) <[email protected]>

Author: welteki

docs/edge/overview.md

@@ -16,6 +16,7 @@ Most of the [OpenFaaS Pro documentation](/docs/openfaas-pro/) and [Helm charts](
 * [Improve container security with gVisor](/edge/gvisor)
 * [OpenTelemetry](/edge/open-telemetry)
 * [Air Gap](/edge/airgap)
+* [Resource constraints](/reference/yaml/#function-memorycpu-limits)
 
 ## Looking for something else?
 

docs/reference/yaml.md

@@ -319,10 +319,20 @@ Example of setting a custom HTTP health check path and initial check delay:
 
 Applying memory and CPU limits can be done through the `limits` and `requests` [fields](https://godoc.org/github.com/openfaas/faas-cli/stack#FunctionResources). It is advisable to always set a limit for your functions to prevent them consuming too many resources in your system.
 
-> Important note: The value for memory for Kubernetes needs to be in the format "Mi".
+When using OpenFaaS on Kubernetes:
+  
+  - Requests ensure the stated host resource is available for the container to use.
+  - Limits specify the maximum amount of host resources that a container can consume.
+
+On OpenFaaS Edge:
+ 
+  - Limits specify the maximum amount of host resources that a container can consume.
+  - Setting requests is not supported. Any requests set on functions will be ignored.
 
 Here we constrain the url-ping function to only use 40Mb of RAM at a maximum.
 
+> Important note: The value for memory for Kubernetes needs to be in the format "Mi".
+
 ```YAML
   url-ping:
     lang: python
@@ -347,11 +357,6 @@ Here we constrain a function to use only `100m` which is equivalent to 1/10 of [
       cpu: 100m
 ```
 
-The meanings and formats of `limits` and `requests` may vary depending on whether you are using Kubernetes or Docker Swarm. In general:
-
- - Requests ensures the stated host resource is available for the container to use
- - Limits specify the maximum amount of host resources that a container can consume
-
 Read more for: [Kubernetes](https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/#how-pods-with-resource-limits-are-run).
 
 ## Configuration