kamon.system.host.LoadAverageMetrics.scala Maven / Gradle / Ivy

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/*
 * =========================================================================================
 * Copyright © 2013-2017 the kamon project 
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language governing permissions
 * and limitations under the License.
 * =========================================================================================
 */

package kamon.system.host

import kamon.Kamon
import kamon.metric.Histogram
import kamon.system.{Metric, MetricBuilder, SigarMetricBuilder}
import org.hyperic.sigar.Sigar
import org.slf4j.Logger

/**
 *  Load Average metrics, as reported by Sigar:
 *    - The system load averages for the past 1, 5, and 15 minutes.
 */
object LoadAverageMetrics extends MetricBuilder("host.load-average") with SigarMetricBuilder {
  def build(sigar: Sigar, metricName: String, logger: Logger) = new Metric {
    val periods = "1" :: "5" :: "15" :: Nil
    val loadAverageMetrics = LoadAverageMetrics(metricName)

    override def update(): Unit = {
      import SigarSafeRunner._

      val loadAverage = runSafe(sigar.getLoadAverage, Array(0D, 0D, 0D), "load-average", logger)

      periods.zipWithIndex.foreach {
        case(period, index) =>
          loadAverageMetrics.forPeriod(period).record(loadAverage(index).toLong)
      }
    }
  }
}

final case class LoadAverageMetrics(metricName: String) {
  val loadAverageMetric = Kamon.histogram(metricName)

  def forPeriod(period: String): Histogram = {
    val periodTag = Map("component" -> "system-metrics", "period" -> period)
    loadAverageMetric.refine(periodTag)
  }
}