Register registers a new active (as opposed to passive) monitor.

ActiveMonitor represents monitorStarts that reach across the network to do things.

PassiveMonitor represents monitorStarts that receive inbound data.

globalPluginsReg maintains the canonical list of valid Heartbeat monitorStarts at runtime.

countersRecorder is used to record start/stop events for a single monitor/plugin to a single registry as counters.

MultiRegistryRecorder composes multiple statsRecorders.

Plugin describes a configured instance of a plug-in with its jobs already instantiated.

PluginFactory represents an uninstantiated plug in instance generated from a monitor config.

ErrPluginAlreadyExists is returned when there is an attempt to register two plugins with the same pluginName.

Type represents whether a plugin is active or passive.