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Metrics

The Ruby agent tracks various system and application metrics. These metrics will be sent regularly to the APM Server and from there to Elasticsearch. You can adjust the interval by setting metrics_interval.

The metrics will be stored in the apm-* index and have the processor.event property set to metric.

System metrics

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Note: Metrics from the Ruby agent are Linux only for now.

`system.cpu.total.norm.pct`

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Type: Float
Format: Percent

The percentage of CPU time in states other than Idle and IOWait, normalised by the number of cores.

`system.memory.total`

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Type: Long
Format: Bytes

The total memory of the system in bytes.

`system.memory.actual.free`

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Type: Long
Format: Bytes

Free memory of the system in bytes.

`system.process.cpu.total.norm.pct`

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Type: Float
Format: Percent

The percentage of CPU time spent by the process since the last event. This value is normalized by the number of CPU cores and it ranges from 0 to 100%.

`system.process.memory.size`

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Type: Long
Format: Bytes

The total virtual memory the process has.

`system.process.memory.rss.bytes`

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Type: Long
Format: Bytes

The Resident Set Size, the amount of memory the process occupies in main memory (RAM).

Ruby Metrics

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`ruby.gc.count`

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Type: Integer
Format: Count

The number of Garbage Collection runs since the process started.

`ruby.threads`

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Type: Integer
Format: Count

The number of threads belonging to the current process.

`ruby.heap.slots.live`

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Type: Integer
Format: Slots

Current amount of heap slots that are live.

NB: Not currently supported on JRuby.

`ruby.heap.slots.free`

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Type: Integer
Format: Slots

Current amount of heap slots that are free.

NB: Not currently supported on JRuby.

`ruby.heap.allocations.total`

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Type: Integer
Format: Objects

Current amount of allocated objects on the heap.

NB: Not currently supported on JRuby.

`ruby.gc.time`

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Type: Float
Format: Seconds

The total time spent in garbage collection.

NB: You need to enable Ruby’s GC Profiler for this to get reported. You can do this at any time when your application boots by calling GC::Profiler.enable.

JVM Metrics

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The following metrics are available when using JRuby. They use the ruby java API to gather metrics via MXBean.

`jvm.memory.heap.used`

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Type: Long
Format: Bytes

The amount of used heap memory in bytes.

`jvm.memory.heap.committed`

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Type: Long
Format: Bytes

The amount of heap memory in bytes that is committed for the Java virtual machine to use. This amount of memory is guaranteed for the Java virtual machine to use.

`jvm.memory.heap.max`

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Type: Long
Format: Bytes

The amount of heap memory in bytes that is committed for the Java virtual machine to use. This amount of memory is guaranteed for the Java virtual machine to use.

`jvm.memory.non_heap.used`

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Type: Long
Format: Bytes

The amount of used non-heap memory in bytes.

`jvm.memory.non_heap.committed`

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Type: Long
Format: Bytes

The amount of non-heap memory in bytes that is committed for the Java virtual machine to use. This amount of memory is guaranteed for the Java virtual machine to use.