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Quacker is a monitoring tool that watches systems and quacks (notifies) when conditions are met. It is configured using XML, which may be specified in many files to encapsulate different logical groups of servers.

<configuration>
  <servers>
    <services>
      <serviceChecks>
        <!-- Service checks go here -->
      </serviceChecks>
    </services>
  </servers>
  <notifiers>
    <!-- Notifiers go here -->
  </notifiers>
</configuration>

Service Checks watch systems, Notifiers communicate the results and History collectors store results over time.