I just clicked on option to "repair equipment" and I got following information:
Your troops' equipment is 1% damaged.
Repairing all damage will cost 1 gold and 2 units of metal.
Repair all damage (1 gold, 1 hour)
I never payed much attention to this but I am little bit curious.
In region reports I never noticed information about production of units of metal.
I also searched, but I haven't found, information about how many units of metal are stored in my region.
Is any building producing units of metal or does a region just produce it automatically?
Where can I find how many units of metal is available in my region?
Is it possible to trade units of metal between regions?