statistics: memory plugin - improve graph by better scaling of y-axis

Utilise alt_autoscale_max to make the memory chart y-axis to scale better
for devices with e.g. 128 MB RAM.

Also fix the axis min value to 0.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
(cherry picked from commit 9a06498dbdf5f5878d2ce86a4b9ac8abc9173bdc)

diff --git a/applications/luci-app-statistics/luasrc/statistics/rrdtool/definitions/memory.lua b/applications/luci-app-statistics/luasrc/statistics/rrdtool/definitions/memory.lua
index a1c65f5..53d559c 100644 (file)
--- a/applications/luci-app-statistics/luasrc/statistics/rrdtool/definitions/memory.lua
+++ b/applications/luci-app-statistics/luasrc/statistics/rrdtool/definitions/memory.lua
@@ -17,6 +17,8 @@ function rrdargs( graph, plugin, plugin_instance, dtype )
                title = "%H: Memory usage",
                vlabel = "MB",
                number_format = "%5.1lf%s",
+               y_min = "0",
+               alt_autoscale_max = true,
                data = {
                        instances = { 
                                memory = { "free", "buffered", "cached", "used" }