old_contents: 'use strict';
  
  // We don't want to require strong-agent, because anything it requires will
  // become untraceable. Still, we need to use its idea of the appName, and access
  // lrtime from the addon, so require the agent internals.
  var addon = require('strong-agent/lib/addon');
  var assert = require('assert');
  var configure = require('strong-agent/lib/config').configure;
  
  exports = module.exports = tracer;
  exports.start = start;
  
  var TRACER = null;
  
  var lrtime = addon ? addon.lrtime : undefined;
  var options = {
    archiveInterval: 20000,
    accountKey: undefined, // Filled in later
    useHttp: false,
    lrtime: lrtime,
  };
  
  function tracer() {
    return TRACER;
  }
  
  function start() {
    assert(!TRACER);
    // This is delayed to allow process.env to be modified up until start time.
    var config = configure(null, null, {}, process.env);
    options.accountKey = config.appName;
    if (options.accountKey)
      TRACER = require('strong-trace')(options);
    return TRACER;
  }
  
new_contents: 'use strict';
  
  // We don't want to require strong-agent, because anything it requires will
  // become untraceable. Still, we need to use its idea of the appName, and access
  // lrtime from the addon, so require the agent internals.
  var addon = require('strong-agent/lib/addon');
  var assert = require('assert');
  var configure = require('strong-agent/lib/config').configure;
  
  exports = module.exports = tracer;
  exports.start = start;
  
  var TRACER = null;
  
  var lrtime = addon ? addon.lrtime : undefined;
  var options = {
    archiveInterval: 20000,
    accountKey: undefined, // Filled in later
    useHttp: false,
    lrtime: lrtime,
    blacklist: ['*node_modules/strong-agent/*'],
  };
  
  function tracer() {
    return TRACER;
  }
  
  function start() {
    assert(!TRACER);
    // This is delayed to allow process.env to be modified up until start time.
    var config = configure(null, null, {}, process.env);
    options.accountKey = config.appName;
    if (options.accountKey)
      TRACER = require('strong-trace')(options);
    return TRACER;
  }
  
subject: add agent probes to the black list