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Name

Functionality

Interface

Implementation(s)

Metrics Service

Serves as a starting point for the Metrics system.
Loads metrics configuration.
Initializes the sink. If the sink is not properly initialized (AMS is not yet deployed), it tries to re-initialize every 5 minutes asynchronously.
Initializes and starts configured sources.

org.apache.ambari.server.metrics.system.MetricsService

org.apache.ambari.server.metrics.system.impl.MetricsServiceImpl

Metric Source

Any sub-component of Ambari Server that has metrics of interest.
Needs subset of metrics configuration corresponding to the source and the Sink to be initialized.
Periodically publishes metrics to the Sink.
Example - JVM, database etc.

org.apache.ambari.server.metrics.system.MetricsSource

org.apache.ambari.server.metrics.system.impl.JvmMetricsSource

org.apache.ambari.server.metrics.system.impl.DatabaseMetricsSource

Metric Sink

Flushes the metrics to an external metrics collection system (Metrics Collector)

org.apache.ambari.server.metrics.system.MetricsSink

org.apache.ambari.server.metrics.system.impl.AmbariMetricSinkImpl

Configuration

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To enable Ambari Server metrics, make sure the following config file exists during Ambari Server start/restart - /All the metrics related configuration are present in the /etc/ambari-server/conf/metrics.properties file. .
Currently, only 2 metric sources have been implemented - JVM Metric Source and Database Metric Source.
To add / remove a metric source to be tracked the following config needs to be modified in the metrics.properties file.
metric.sources=jvm,database
Source specific configs are discussed in the metrics source section.

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