docs: Update release notes with Envoy compat issue (#16494)

* Update v1_15_x.mdx --------- Co-authored-by: Tu Nguyen <[email protected]>
hashicorp · Mar 1, 2023 · 21c3095 · 21c3095
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diff --git a/website/content/docs/release-notes/consul/v1_15_x.mdx b/website/content/docs/release-notes/consul/v1_15_x.mdx
@@ -68,6 +68,18 @@ For more detailed information, please refer to the [upgrade details page](/consu
 
 The following issues are known to exist in the v1.15.0 release:
 
+- For v1.15.0, Consul is reporting newer releases of Envoy (for example, v1.25.1) as not supported, even though these versions are listed as valid in the [Envoy compatilibity matrix](/consul/docs/connect/proxies/envoy#envoy-and-consul-client-agent). The following error would result for newer versions of Envoy:
+
+  ```log hideClipboard
+  Envoy version 1.25.1 is not supported. If there is a reason you need to use this version of envoy use the ignore-envoy-compatibility flag. Using an unsupported version of Envoy is not recommended and your experience may vary.
+  ```
+
+  The workaround to resolve this issue until Consul v1.15.1 would be to run the client agents with the new `ingore-envoy-compatiblity` flag: 
+
+  ```shell-session
+  $ consul connect envoy --ignore-envoy-compatibility
+  ```
+
 - For v1.15.0, there is a known issue where `consul acl token read -self` requires an `-accessor-id`. This is resolved in the uppcoming Consul v1.15.1 patch release.
 
 - For v1.15.0, there is a known issue where search filters produced errors and resulted in lists not showing full results until being interacted with. This is resolved in the upcoming Consul v1.15.1 patch release.