Merge pull request #792 from dobesv/patch-1

Improve docs for health checker and system stats configs

Author: k8s-ci-robot

Diff for: README.md

@@ -62,9 +62,9 @@ List of supported problem daemons types:
 | Problem Daemon Types |  NodeCondition  | Description | Configs | Disabling Build Tag |
 |----------------|:---------------:|:------------|:--------|:--------------------|
 | [SystemLogMonitor](https://github.com/kubernetes/node-problem-detector/tree/master/pkg/systemlogmonitor) | KernelDeadlock ReadonlyFilesystem FrequentKubeletRestart FrequentDockerRestart FrequentContainerdRestart | A system log monitor monitors system log and reports problems and metrics according to predefined rules. | [filelog](https://github.com/kubernetes/node-problem-detector/blob/master/config/kernel-monitor-filelog.json), [kmsg](https://github.com/kubernetes/node-problem-detector/blob/master/config/kernel-monitor.json), [kernel](https://github.com/kubernetes/node-problem-detector/blob/master/config/kernel-monitor-counter.json) [abrt](https://github.com/kubernetes/node-problem-detector/blob/master/config/abrt-adaptor.json) [systemd](https://github.com/kubernetes/node-problem-detector/blob/master/config/systemd-monitor-counter.json) | disable_system_log_monitor
-| [SystemStatsMonitor](https://github.com/kubernetes/node-problem-detector/tree/master/pkg/systemstatsmonitor) | None(Could be added in the future) | A system stats monitor for node-problem-detector to collect various health-related system stats as metrics. See the proposal [here](https://docs.google.com/document/d/1SeaUz6kBavI283Dq8GBpoEUDrHA2a795xtw0OvjM568/edit). | | disable_system_stats_monitor
+| [SystemStatsMonitor](https://github.com/kubernetes/node-problem-detector/tree/master/pkg/systemstatsmonitor) | None(Could be added in the future) | A system stats monitor for node-problem-detector to collect various health-related system stats as metrics. See the proposal [here](https://docs.google.com/document/d/1SeaUz6kBavI283Dq8GBpoEUDrHA2a795xtw0OvjM568/edit). | [system-stats-monitor](https://github.com/kubernetes/node-problem-detector/blob/master/config/system-stats-monitor.json) | disable_system_stats_monitor
 | [CustomPluginMonitor](https://github.com/kubernetes/node-problem-detector/tree/master/pkg/custompluginmonitor) | On-demand(According to users configuration), existing example: NTPProblem | A custom plugin monitor for node-problem-detector to invoke and check various node problems with user-defined check scripts. See the proposal [here](https://docs.google.com/document/d/1jK_5YloSYtboj-DtfjmYKxfNnUxCAvohLnsH5aGCAYQ/edit#). | [example](https://github.com/kubernetes/node-problem-detector/blob/4ad49bbd84b8ced45ac825eac01ec93d9235935e/config/custom-plugin-monitor.json) | disable_custom_plugin_monitor
-| [HealthChecker](https://github.com/kubernetes/node-problem-detector/tree/master/pkg/healthchecker) | KubeletUnhealthy ContainerRuntimeUnhealthy| A health checker for node-problem-detector to check kubelet and container runtime health. | [kubelet](https://github.com/kubernetes/node-problem-detector/blob/master/config/health-checker-kubelet.json) [docker](https://github.com/kubernetes/node-problem-detector/blob/master/config/health-checker-docker.json) | 
+| [HealthChecker](https://github.com/kubernetes/node-problem-detector/tree/master/pkg/healthchecker) | KubeletUnhealthy ContainerRuntimeUnhealthy| A health checker for node-problem-detector to check kubelet and container runtime health. | [kubelet](https://github.com/kubernetes/node-problem-detector/blob/master/config/health-checker-kubelet.json) [docker](https://github.com/kubernetes/node-problem-detector/blob/master/config/health-checker-docker.json) [containerd](https://github.com/kubernetes/node-problem-detector/blob/master/config/health-checker-containerd.json) | 
 
 # Exporter
 
@@ -102,8 +102,13 @@ certain backends. Some of them can be disabled at compile-time using a build tag
 
 * `--config.custom-plugin-monitor`: List of paths to custom plugin monitor config files, comma-separated, e.g.
   [config/custom-plugin-monitor.json](https://github.com/kubernetes/node-problem-detector/blob/master/config/custom-plugin-monitor.json).
-  Node problem detector will start a separate custom plugin monitor for each configuration. You can
+  Node problem detector will start a separate custom plugin monitor for each configuration.  You can
   use different custom plugin monitors to monitor different node problems.
+  
+  
+#### For Health Checkers
+
+  Health checkers are configured as custom plugins, using the config/health-checker-*.json config files.
 
 #### For Kubernetes exporter