How Does Sentry Handle Metrics Ingestion and Trace Metrics in Next.js Projects?
Understanding how Sentry processes metrics ingestion and trace metrics is essential for effectively configuring and monitoring your Next.js projects. This article explains the key aspects of metrics handling, including SDK-level settings, response codes, and project metadata behavior.
Overview of Metrics Ingestion in Sentry
Sentry provides tools for capturing and analyzing metrics, such as trace metrics, to help monitor application performance. However, the ingestion and processing of these metrics involve distinct steps and configurations.
SDK-Level vs Backend-Level Metrics Handling
The enableMetrics setting in the Sentry JavaScript/Next.js SDK controls whether the SDK emits Application Metrics, such as sending trace_metric envelopes. This is an SDK-only setting and does not enable any backend, project, or account-level capabilities for metrics ingestion.
Understanding Sentry Response Codes
When submitting trace metrics, a 2xx response from the Sentry envelope ingestion endpoint indicates that Sentry has received the envelope. However, this response does not guarantee that the metric has been accepted or stored (indexed). The acceptance and storage of metrics are separate processes from the transport receipt.
Project Metadata and Trace Metrics
The project metadata field hasTraceMetrics becomes true only after Sentry records an accepted trace_metric_byte outcome for the project. Even if envelopes are received and a 2xx response is returned, this field will remain false until an accepted outcome is recorded.
By understanding these distinctions, you can better configure your Sentry SDK and interpret the metrics-related responses and metadata for your Next.js projects.