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Container Metrics

Sematext Agent offers a unified and agnostic approach to container engine monitoring and visibility. Containers are discovered from cgroupfs hierarchies and all the metrics are fetched directly from accounting data exposed through cgroup controllers. We have support for Docker, rkt and containerd container runtimes.

Metrics

The following table recaps all the metrics shipped by the agent.

Memory

Metric name Description
resident memory usage Represents container resident memory usage in bytes
cache memory Is the amount of memory allocated for page cache. The total amount of memory consumed by a container is the sum of RSS + cache memory
memory fail counter Is the number of times that memory cgroup limit was exceeded
memory limit Designates the max allowed memory limit for the container cgroup
memory soft limit Represents the initial memory reservation for the container
memory pages in The number of events each time the page is accounted to the container cgroup
memory pages out Is the number of events each time a page is unaccounted from the container cgroup
memory page faults Represents the number of page faults accounted the cgroup
memory pages fault major Represents the number of major page faults accounted the cgroup
swap size Is the number of bytes of swap usage
swap limit Represents the swap memory usage limit

Disk

Metric name Description
read bytes Is the number of bytes read from the disk
read time Represents the total amount of time (in nanoseconds) between read request dispatch and request completion
read wait time Represents total amount of time the read I/O operations for the container spent waiting in the scheduler queues
write bytes Is the number of bytes written to the disk
write time Represents the total amount of time (in nanoseconds) between write request dispatch and request completion
write wait time Represents total amount of time the write I/O operations for the container spent waiting in the scheduler queues
io weight Specifies the relative proportion of block I/O access ranging from 100 to 1000

CPU

Metric name Description
cpu usage Represents the container CPU usage in %
throttled time Is the total amount of time that processes have been throttled in the container cgroup
cpu shares Represents the weight of the cgroup that translates into the amount of CPU it is expected to get. Upon cgroup creation each group gets assigned a default of 1024
cpu quota Enforces a hard limit to the CPU time allocated to processes
cpu period Is the time window expressed in microseconds that represents the period for which processes are allowed to run under specific quota

Network

Metric name Description
received bytes Received amount of bytes on the network interface
received packets Received amount of packets on the network interface
received errors Received amount of errors on the network interface
dropped ingress packets The amount of dropped inbound packets on the network interface
transmitted bytes Transmitted amount of bytes on the network interface
transmitted packets Transmitted amount of packets on the network interface
transmitted errors Transmitted amount of errors on the network interface
dropped egress packets The amount of dropped outbound packets on the network interface