Add README

README.md

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+# cgroup Prometheus exporter
+
+[![Build Status](https://circleci.com/gh/treydock/cgroup_exporter/tree/master.svg?style=shield)](https://circleci.com/gh/treydock/cgroup_exporter)
+[![GitHub release](https://img.shields.io/github/v/release/treydock/cgroup_exporter?include_prereleases&sort=semver)](https://github.com/treydock/cgroup_exporter/releases/latest)
+![GitHub All Releases](https://img.shields.io/github/downloads/treydock/cgroup_exporter/total)
+
+# Check mount Prometheus exporter
+
+The `cgroup_exporter` produces metrics from cgroups.
+
+This exporter by default listens on port `9306` and all metrics are exposed via the `/metrics` endpoint.
+
+# Usage
+
+The `--config.paths` flag is required and must point to paths of cgroups to monitor. If there is `/sys/fs/cgroup/cpuacct/user.slice` then the value for `--config.paths` would be `/user.slice`.
+
+## Docker
+
+Example of running the Docker container
+
+```
+docker run -d -p 9306:9306 -v "/:/host:ro,rslave" treydock/cgroup_exporter --path.cgroup.root=/host/sys/fs/cgroup
+```
+
+## Install
+
+Download the [latest release](https://github.com/treydock/cgroup_exporter/releases)
+
+## Build from source
+
+To produce the `cgroup_exporter` binaries:
+
+```
+make build
+```
+
+Or
+
+```
+go get github.com/treydock/cgroup_exporter
+```
+
+## Metrics
+
+Example of metrics exposed by this exporter when looking at `/user.slice` paths:
+
+```
+cgroup_cpu_kernel_seconds{cgroup="/user.slice/user-20821.slice"} 1.96
+cgroup_cpu_total_seconds{cgroup="/user.slice/user-20821.slice"} 3.817500568
+cgroup_cpu_user_seconds{cgroup="/user.slice/user-20821.slice"} 1.61
+cgroup_cpus{cgroup="/user.slice/user-20821.slice"} 0
+cgroup_memory_fail_count{cgroup="/user.slice/user-20821.slice"} 0
+cgroup_memory_total_bytes{cgroup="/user.slice/user-20821.slice"} 6.8719476736e+10
+cgroup_memory_used_bytes{cgroup="/user.slice/user-20821.slice"} 6.90176e+06
+cgroup_swap_fail_count{cgroup="/user.slice/user-20821.slice"} 0
+cgroup_swap_total_bytes{cgroup="/user.slice/user-20821.slice"} 9.223371968135295e+18
+cgroup_swap_used_bytes{cgroup="/user.slice/user-20821.slice"} 0
+cgroup_userslice_info{cgroup="/user.slice/user-20821.slice",uid="20821",username="tdockendorf"} 1
+```
+
+Example of metrics exposed by this exporter when looking at `/slurm` paths:
+
+```
+cgroup_cpu_kernel_seconds{cgroup="/slurm/uid_20821/job_12"} 0
+cgroup_cpu_total_seconds{cgroup="/slurm/uid_20821/job_12"} 0.007840451
+cgroup_cpu_user_seconds{cgroup="/slurm/uid_20821/job_12"} 0
+cgroup_cpus{cgroup="/slurm/uid_20821/job_12"} 2
+cgroup_exporter_success 1
+cgroup_job_info{cgroup="/slurm/uid_20821/job_12",jobid="12",uid="20821",username="tdockendorf"} 1
+cgroup_memory_total_bytes{cgroup="/slurm/uid_20821/job_12"} 2.147483648e+09
+cgroup_memory_used_bytes{cgroup="/slurm/uid_20821/job_12"} 315392
+cgroup_swap_total_bytes{cgroup="/slurm/uid_20821/job_12"} 2.147483648e+09
+cgroup_swap_used_bytes{cgroup="/slurm/uid_20821/job_12"} 315392
+```
+
+Example of metrics exposed by this exporter when looking at `/torque` paths:
+
+```
+cgroup_cpu_kernel_seconds{cgroup="/torque/1182958.pitzer-batch.ten.osc.edu"} 26.35
+cgroup_cpu_total_seconds{cgroup="/torque/1182958.pitzer-batch.ten.osc.edu"} 939.568245515
+cgroup_cpu_user_seconds{cgroup="/torque/1182958.pitzer-batch.ten.osc.edu"} 915.61
+cgroup_cpus{cgroup="/torque/1182958.pitzer-batch.ten.osc.edu"} 40
+cgroup_exporter_success 1
+cgroup_job_info{cgroup="/torque/1182958.pitzer-batch.ten.osc.edu",jobid="1182958",uid="",username=""} 1
+cgroup_memory_total_bytes{cgroup="/torque/1182958.pitzer-batch.ten.osc.edu"} 1.96755132416e+11
+cgroup_memory_used_bytes{cgroup="/torque/1182958.pitzer-batch.ten.osc.edu"} 5.3434466304e+10
+cgroup_swap_total_bytes{cgroup="/torque/1182958.pitzer-batch.ten.osc.edu"} 1.96755132416e+11
+cgroup_swap_used_bytes{cgroup="/torque/1182958.pitzer-batch.ten.osc.edu"} 5.3434466304e+10
+```