# Package org.springframework.core.metrics

@NonNullApi @NonNullFields package org.springframework.core.metrics
Support package for recording metrics during application startup.

Related Packages
Package
Description
org.springframework.core
Provides basic classes for exception handling and version detection, and other core helpers that are not specific to any part of the framework.
org.springframework.core.metrics.jfr
Support package for recording startup metrics using Java Flight Recorder.
Interfaces
Class
Description
ApplicationStartup
Instruments the application startup phase using `steps`.
StartupStep
Step recording metrics about a particular phase or action happening during the `ApplicationStartup`.
StartupStep.Tag
Simple key/value association for storing step metadata.
StartupStep.Tags
Immutable collection of `StartupStep.Tag`.