Plugins are recommended to have a stability field that communicates the state of development of the plugin. It can contain the following values:

• STABILITY_0_DEPRECATED - Deprecated. This plugin is not recommended for new projects
• STABILITY_1_EXPERIMENTAL - Experimental. Non-backward compatible changes or removal may occur in any future release. Use of the plugin is not recommended in production environments
• STABILITY_2_STABLE - Stable.
• STABILITY_3_LEGACY - Legacy. Although this plugin is unlikely to be removed, it is no longer actively maintained, and other alternatives are available

These stability levels are taken from the Node.js project - https://nodejs.org/api/documentation.html#stability-index.