Installs the phase observer, or clears it when passed null.
null
Called by initialize from config.onPhase; exported so tests and benchmark harnesses can attach a collector without reinitializing.
config.onPhase
Observer to install, or null to disable instrumentation
1.4.0
Installs the phase observer, or clears it when passed
null.Called by initialize from
config.onPhase; exported so tests and benchmark harnesses can attach a collector without reinitializing.