[v10.2.x] Service Accounts: Add deprecation message for apikeys (#80360)

Co-authored-by: Eric Leijonmarck <eric.leijonmarck@gmail.com>

docs/sources/administration/api-keys/index.md

@@ -17,6 +17,10 @@ weight: 700
 
 # API keys
 
+{{% admonition type="note" %}}
+Deprecated: [Service accounts]({{< relref "../service-accounts/" >}}) have replaced API keys as the primary way to authenticate applications that interact with Grafana.
+{{% /admonition %}}
+
 An API key is a randomly generated string that external systems use to interact with Grafana HTTP APIs.
 
 When you create an API key, you specify a **Role** that determines the permissions associated with the API key. Role permissions control that actions the API key can perform on Grafana resources.

docs/sources/administration/service-accounts/index.md

@@ -22,7 +22,7 @@ weight: 800
 You can use a service account to run automated workloads in Grafana, such as dashboard provisioning, configuration, or report generation. Create service accounts and tokens to authenticate applications, such as Terraform, with the Grafana API.
 
 {{% admonition type="note" %}}
-Service accounts will eventually replace [API keys]({{< relref "../api-keys/" >}}) as the primary way to authenticate applications that interact with Grafana.
+Service accounts replace [API keys]({{< relref "../api-keys/" >}}) as the primary way to authenticate applications that interact with Grafana.
 {{% /admonition %}}
 
 A common use case for creating a service account is to perform operations on automated or triggered tasks. You can use service accounts to: