[Pacemaker] Rule constraint monitoring interval

[Sam Gardner]

As I understand it, there are two ways to monitor the status of a resource.

1) Use the monitor action on the resource agent script - this is equivalent
to polling the resource at every <monitor interval>

2) Write a value into the cib, and create a constraint rule and scoring to
handle failover based on the value of that attribute. This is what the
ocf:heartbeat:ethmonitor resource agent does.

In the second case, what is the interval at which the cib value is
monitored? Does the constraint rule just get checked on an event basis -
ie, whenever the cib value changes, the rule is evaluated again)?

Thanks,
Sam
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