Possible execution states for an environment.

STATE_UNSPECIFIED The environment's states is unknown.
DISABLED The environment is not running and can't be connected to. Starting the environment will transition it to the STARTING state.
STARTING The environment is being started but is not yet ready to accept connections.
RUNNING The environment is running and ready to accept connections. It will automatically transition back to DISABLED after a period of inactivity or if another environment is started.
DELETING The environment is being deleted and can't be connected to.