docs: update jwt authentication metric (#6502)

docs/source/routing/security/jwt.mdx

@@ -745,12 +745,16 @@ If you _do_ need to pass entire JWTs to subgraphs, you can do so via the GraphOS
 
 If your router enables [tracing](/router/configuration/telemetry/exporters/tracing/overview), the JWT authentication plugin has its own tracing span: `authentication_plugin`
 
-If your router enables [metrics collection via Prometheus](/router/configuration/telemetry/exporters/metrics/prometheus), the JWT authentication plugin provides and exports the following metrics:
+If your router [exports metrics](/router/configuration/telemetry/exporters/metrics), the JWT authentication plugin exports the `apollo.router.operations.authentication.jwt` metric. You can use the metric's `authentication.jwt.failed` attribute to count failed authentications. If the `authentication.jwt.failed` attribute is absent or `false`, the authentication succeeded.
+
+<Note>
+
+Before [v1.59.0](https://github.com/apollographql/router/releases/tag/v1.59.0), the JWT authentication exported the following metrics:
 
 - `apollo_authentication_failure_count`
 - `apollo_authentication_success_count`
 
-Those metrics have the following shapes:
+These metrics have the following shapes:
 
 ```
 # HELP apollo_authentication_failure_count apollo_authentication_failure_count
@@ -762,6 +766,10 @@ apollo_authentication_failure_count{kind="JWT",service_name="apollo-router"} 1
 apollo_authentication_success_count{kind="JWT",service_name="apollo-router"} 11
 ```
 
+These metrics are [deprecated](graphos/reference/router/telemetry/instrumentation/standard-instruments#deprecated). Please update to the most recent router version to use the updated `apollo.router.operations.authentication.jwt` metric.
+
+</Note>
+
 ## Additional resources
 
 You can use the Apollo Solutions [router JWKS generator](https://github.com/apollosolutions/router-jwks-generator) to create a router configuration file for use with the authentication plugin.