@ca-apm/native-metrics/lib/gcstats.js

Monitor Native matrics like GC and Event loop stats

 
/**
 * Copyright (c) 2015 CA. All rights reserved.
 *
 * This software and all information contained therein is confidential and proprietary and
 * shall not be duplicated, used, disclosed or disseminated in any way except as authorized
 * by the applicable license agreement, without the express written permission of CA. All
 * authorized reproductions must be marked with this language.
 *
 * EXCEPT AS SET FORTH IN THE APPLICABLE LICENSE AGREEMENT, TO THE EXTENT
 * PERMITTED BY APPLICABLE LAW, CA PROVIDES THIS SOFTWARE WITHOUT WARRANTY
 * OF ANY KIND, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL CA BE
 * LIABLE TO THE END USER OR ANY THIRD PARTY FOR ANY LOSS OR DAMAGE, DIRECT OR
 * INDIRECT, FROM THE USE OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, LOST
 * PROFITS, BUSINESS INTERRUPTION, GOODWILL, OR LOST DATA, EVEN IF CA IS
 * EXPRESSLY ADVISED OF SUCH LOSS OR DAMAGE.
 */

var gc = (require('@sematext/gc-stats'))();
var heap = require('ca-apm-probe/lib/heap');

var os = require('os');
var osScope = os.hostname();
var processScope = osScope + ' - Process[' + process.pid + ']';

var gcstats = [];

exports.init = function(agent) {
  gc.on('stats', function (stats) {
    var len = gcstats.push(stats.after.usedHeapSize);
    var total = gcstats.reduce(function(a, b) { return a + b });
    var baseline = total / len;
    agent.metric(processScope, 'GC Full. V8 heap used', baseline, 'Bytes');

    if (len > 10) {
      gcstats.shift();  // Sliding window.
    }
  // collect updated heap metrics after gc
  heap.collectHeap();
  });
};