docs: public static void mainUsage(PrintStream ps) {
      StringBuilder b = new StringBuilder("\nUsage: java -jar [opentsdb.jar] [command] [args]\nValid commands:")
        .append("\n\ttsd: Starts a new TSDB instance")
        .append("\n\tfsck: Searches for and optionally fixes corrupted data in a TSDB")
        .append("\n\timport: Imports data from a file into HBase through a TSDB")
        .append("\n\tmkmetric: Creates a new metric")
        .append("\n\tquery: Queries time series data from a TSDB ")
        .append("\n\tscan: Dumps data straight from HBase")
        .append("\n\tuid: Provides various functions to search or modify information in the tsdb-uid table. ")
        .append("\n\texportui: Exports the OpenTSDB UI static content")
        .append("\n\n\tUse help <command> for details on a command\n");
      ps.println(b);
    }