Add "Runtime arena memory" panel to "Tarantool runtime overview" section. It displays tnt_runtime_used default metric.
Rename "Lua runtime memory" panel to "Lua memory" to not confuse users after adding "Runtime arena memory" panel. Update panel description so it would be easier to understand the differences between two panels.
Merge after #169
Add "Runtime arena memory" panel to "Tarantool runtime overview" section. It displays
tnt_runtime_used
default metric.Rename "Lua runtime memory" panel to "Lua memory" to not confuse users after adding "Runtime arena memory" panel. Update panel description so it would be easier to understand the differences between two panels.
Closes #140