Which back-end component in the stream processor pipeline is shared between application and infrastructure?

IBM Instana’s documentation for internal architecture and stream processor pipeline defines component functions explicitly. The "Filler" is the only back-end element in the pipeline that is shared and invoked for both application traces/events and infrastructure metrics. The documentation states: "The Filler in Instana stream processor pipeline is called for both infrastructure and application data, ensuring all metrics and traces are normalized before further processing, storage, or analysis." The Processor and Acceptor components serve routing or ingestion flows, while Log-Processor is dedicated to log handling. The Filler centralizes mapping of tags, metric normalization, and correlation logic for all incoming telemetry, supporting Instana’s unified observability workflows and high-throughput analytics. This ensures the same processing logic applies whether data is sourced from an application, host, container, or cloud entity.