module:set_global();

local metric = require"core.statsmanager".metric;

local pposix = require"util.pposix";

local allocated = metric(

	"gauge", "malloc_heap_allocated", "bytes",

	"Allocated bytes by mode of allocation",

	{"mode"}

);

local used = metric(

	"gauge", "malloc_heap_used", "bytes",

	"Used bytes"

):with_labels();

local unused = metric(

	"gauge", "malloc_heap_unused", "bytes",

	"Unused bytes"

):with_labels();

local returnable = metric(

	"gauge", "malloc_heap_returnable", "bytes",

	"Returnable bytes"

):with_labels();

module:hook("stats-update", function ()

	local meminfo = pposix.meminfo();

	if meminfo.allocated then

		allocated:with_labels("sbrk"):set(meminfo.allocated);

	end

	if meminfo.allocated_mmap then

		allocated:with_labels("mmap"):set(meminfo.allocated_mmap);

	end

	if meminfo.used then

		used:set(meminfo.used);

	end

	if meminfo.unused then

		unused:set(meminfo.unused);

	end

	if meminfo.returnable then

		returnable:set(meminfo.returnable);

	end

end);