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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, containerd, crio, and podman 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 |