observability-instrumentation

You emit CloudWatch EMF metrics by using event subscribers that listen for domain events and trigger a dedicated metric emitter. This emitter uses a Monolog EMF channel to format and output metrics that CloudWatch can extract.

AWS EMF for business observability is a format that embeds metrics within structured logs to track business KPIs. You use it when domain events and API endpoints lack structured, business-focused observability beyond infrastructure metrics.

You structure typed metrics by creating dedicated metric classes and dimension data handled by event subscribers. This SOLID architecture decouples metric emission from handlers by using a dedicated emitter for single metrics or collections.

Yes, you can batch multiple domain metrics into a single CloudWatch EMF log by using a MetricCollection. This allows the dedicated emitter to group multiple typed metrics together for formatted output via the Monolog EMF channel.

Yes, you need a Monolog EMF channel to format and output AWS EMF metrics from domain events. The architecture requires this logging channel alongside typed metric classes and dimension data to generate extractable CloudWatch metrics.

The best way to track business KPIs is to emit EMF-based metrics directly from domain events using event subscribers. This provides typed, domain-specific observability through formatted logs that CloudWatch extracts as actionable business metrics.