Add note about internal metric prefix changes in Collector v0.106.1

Author: Tharanishwaran

content/en/docs/collector/internal-telemetry.md

@@ -49,6 +49,12 @@ Each verbosity level represents a threshold at which certain metrics are
 emitted. For the complete list of metrics, with a breakdown by level, see
 [Lists of internal metrics](#lists-of-internal-metrics).
 
+> **Note:** As of Collector version v0.106.1, internal metric names are handled differently based on their source:
+> - Metrics generated from Collector components are prefixed with `otelcol_`.
+> - Metrics generated from instrumentation libraries do not use the `otelcol_` prefix.
+> 
+> For Collector versions prior to v0.106.1, all internal metrics, regardless of their origin, were prefixed with `otelcol_`. This includes metrics from both Collector components and instrumentation libraries.
+
 The default level for metrics output is `normal`. To use another level, set
 `service::telemetry::metrics::level`:
 
@@ -57,7 +63,7 @@ service:
   telemetry:
     metrics:
       level: detailed
-```
+
 
 The Collector can also be configured to scrape its own metrics using a
 [Prometheus receiver](https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/receiver/prometheusreceiver)