Which component automatically adds host ID and host name context to each metric?

The correct answer is the Extension Execution Controller (EEC), which is responsible for enhancing the data collected by Dynatrace by automatically appending host context, such as host ID and host name, to each metric. This capability is crucial as it allows for more granular analysis and monitoring of metrics across different hosts. By automatically enriching metrics with contextual information, users can gain deeper insights into performance issues, resource utilization, and operational metrics, making it easier to pinpoint problems within specific hosts.

The Metric ingestion protocol pertains more to how metrics are being ingested into the system rather than the contextual enhancement of those metrics. The Data processing engine handles the broader task of processing and analyzing data but does not specifically focus on adding host context. The Metric analysis module is involved in the interpretation and visualization of metrics but is not responsible for the contextualization at the point of metric ingestion.