True story, 10 years ago I was doing linear regression on infra data to predict capacity issues. My system knew when it had made a prediction and when capacity

True story, 10 years ago I was doing linear regression on infra data to predict capacity issues. My system knew when it had made a prediction and when capacity increased so based on the lag it could tell you the exact date to place an order so more disks could be added to the array before a threshold was breached. And whatever else we were monitoring too, batch job completion times vs number of CPUs, the whole works. PCA to figure out what was relevant. Clever stuff you might think. In reality no one cared. We went on placing a disk order whenever the first dumb nagios alert paged someone. We bought more CPUs when the moaning from the analysts reached the CEO and he in turn moaned to our manager. It was fun to do and I learnt alot but realistically the impact on the business was minimal...