RateLimiterCluster doesn't work in app launched by PM2
RateLimiterCluster doesn't work in app launched by PM2, since master in PM2 environment can't send messages via IPC, separate RateLimiterClusterMasterPM2 have to be implemented.

See this example: https://gist.github.com/nethoncho/b1160edacfe3e12a336c34e98f04cb2a