+# service instance for Debian's mirror-health checker
+#
+# for each defined service, a daemon will regularly check if the
+# local version of <url> matches the majority version among the
+# set of all hosts that define a <service_name>.
+#
+# the result of this check is then exposed via <health_url>
+#
+# @param url URL to check for freshness on each host (normally a Release file)
+# @param health_url URL to the health marker
+# @param this_host_service_name this host's service name for this service.
+# Other nodes will connect to this hostname to
+# fetch url for checking.
+# If this is undef, other hosts will not
+# check this host.
+# @param check_service name of this service
+# @param check_interval how often to check
+# @param ensure present or absent