amp_init

See hook in action

See this hook used in plugins:

Select Pluginjetpack.12.1jetpack.12.1.1jetpack.12.2.1jetpack.12.3jetpack.12.5jetpack.12.6.1jetpack.12.7.1jetpack.12.8jetpack.12.8.1jetpack.12.9jetpack.12.9.3jetpack.13.0jetpack.13.1.1jetpack.13.1.3jetpack.13.2jetpack.13.2.1