Fix warning callout for metrics configuration (#203)

Author: licitdev

Diff for: content/configuration/16.metrics.md

@@ -12,9 +12,8 @@ To enable performance and error measurement of connected services, Directus can
 | `METRICS_TOKENS`   | A CSV of tokens to allow access to via a `Authorization: Metrics <token>` header. By default it is restricted to admins | --                             |
 | `METRICS_SERVICES` | A CSV of directus services to observe metrics for. Currently `database`, `cache`, `redis` and `storage` are supported   | `database,cache,redis,storage` |
 
-::: warning Metric Aggregation
-
+::callout{icon="material-symbols:warning-rounded" color="amber"}
+**Metric Aggregation**
 If Directus is running within a PM2 context, then metrics will be aggregated on a per scheduled job frequency. Ensure
 Prometheus' scrape frequency takes that into account.
-
-:::
+::