Bring the change from #1801 into 2.16 and 2-edge docs (#1840)

Signed-off-by: Flynn <[email protected]>
linkerd · Sep 10, 2024 · e666702 · e666702
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diff --git a/linkerd.io/content/2-edge/tasks/using-ingress.md b/linkerd.io/content/2-edge/tasks/using-ingress.md
@@ -61,6 +61,11 @@ header was *required* in ingress mode, or the request would fail. This bug was
 fixed in 2.13.5, and was not present prior to 2.13.0.
 {{< /note >}}
 
+{{< note >}}
+Be sure to not deploy the ingress controller in the `kube-system` or `cert-manager`
+namespace, as Linkerd [ignores these namespaces by default for injection](https://linkerd.io/2-edge/features/proxy-injection/#exclusions).
+{{< /note >}}
+
 For more on ingress mode and why it's necessary, see [Ingress
 details](#ingress-details) below.
 

diff --git a/linkerd.io/content/2.16/tasks/using-ingress.md b/linkerd.io/content/2.16/tasks/using-ingress.md
@@ -61,6 +61,11 @@ header was *required* in ingress mode, or the request would fail. This bug was
 fixed in 2.13.5, and was not present prior to 2.13.0.
 {{< /note >}}
 
+{{< note >}}
+Be sure to not deploy the ingress controller in the `kube-system` or `cert-manager`
+namespace, as Linkerd [ignores these namespaces by default for injection](https://linkerd.io/2.16/features/proxy-injection/#exclusions).
+{{< /note >}}
+
 For more on ingress mode and why it's necessary, see [Ingress
 details](#ingress-details) below.