JAVA J2EE 4 U

 function processLines(input, e_status) {

    e_status = e_status - 1;

    var lines = input.split('\n').filter(line => line.trim() !== "");

    for (var i = 0; i < lines.length; i++) {

        var line = lines[i].trim();

        var lagValue = parseFloat(line);

        if (isNaN(lagValue)) {

            return `Invalid lag value detected: "${line}"`;

        }

        if (lagValue > 0) {

            return `Cluster has lag (${lagValue}MB). Exiting...`;

        }

    }

    return "Cluster is in sync, proceeding";

}