xpath_boolean(xml, xpath) – Returns true if the XPath expression evaluates to true, or if a

xpath_float(xml, xpath) – Returns a float value, the value zero if no match is found,

xpath_int(xml, xpath) – Returns an integer value, or the value zero if no match is

xpath_double(xml, xpath) – Returns a double value, the value zero if no match is found,

xpath(xml, xpath) – Returns a string array of values within the nodes of xml that

This function writes metrics to the TSDB (metics names should look like proc.loadavg.1min, http.hits while