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Started phase 0 (prometheus Ramp up json), duration: 60s @ 09:39:33(-0600) 2019-06-06
..  /usr/local/lib/node_modules/artillery-plugin-prometheus/node_modules/prom-client/lib/registry.js:35
		const defaultLabelNames = Object.keys(this._defaultLabels);
		                                 ^

TypeError: Cannot convert undefined or null to object
    at Function.keys (<anonymous>)
    at Registry.getMetricAsPrometheusString (/usr/local/lib/node_modules/artillery-plugin-prometheus/node_modules/prom-client/lib/registry.js:35:36)
    at Registry.metrics (/usr/local/lib/node_modules/artillery-plugin-prometheus/node_modules/prom-client/lib/registry.js:82:23)
    at Pushgateway.useGateway (/usr/local/lib/node_modules/artillery-plugin-prometheus/node_modules/prom-client/lib/pushgateway.js:78:27)
    at Pushgateway.pushAdd (/usr/local/lib/node_modules/artillery-plugin-prometheus/node_modules/prom-client/lib/pushgateway.js:23:14)
    at Object.pushToGateway (/usr/local/lib/node_modules/artillery-plugin-prometheus/lib/prometheus.js:156:24)
    at Object.reportResults (/usr/local/lib/node_modules/artillery-plugin-prometheus/lib/prometheus.js:137:9)
    at EventEmitter.<anonymous> (/usr/local/lib/node_modules/artillery-plugin-prometheus/lib/prometheus.js:178:10)
    at EventEmitter.emit (events.js:194:15)
    at Timeout.sendStats [as _onTimeout] (/usr/local/lib/node_modules/artillery/core/lib/runner.js:305:8)

config:
  plugins:
    prometheus:
      testName: 'ImaTestRun'
      pushGatewayUrl: 'http://localhost:9090'
      environment: qa
      labels:
        target: 'http://foo.com/'
        scenario: Reports_Big