I worked at a place doing network appliance stuff. We managed and developed the machines, and product to end users. A simple dashboard increased our effectiveness by an order of magnitude. Some simple graphs and deep knowledge of the code really really helped. Some data from other departments combined with this was amazing. A simple color coded call queue count told us there was a problem before the front-line tech support people could even report it. Simple analysis of that queue told us where to look for problems: a predominance of one area code told us to examine specific machines (and which subset!), while a wide array of area codes told us that it was probably in billing or comms infrastructure. A couple of graphs of network traffic and system load told me what what the problem could be. I don’t know how, I couldn’t write code to do it, but I certainly could get to the problem much faster with that minimal input from graphs.