How to monitor PostgreSQL? Which metrics to rely upon? How to facilitate immediate display of apparent causes of the problem in your monitoring?<br /> <br /> What's to blame, a heavy query or slow discs? Did modification of settings help to alleviate issues on the entire database or only for specific requests? Did the performance improve or degrade after a release of application? How to collect and visualize everything in the right way, which triggers can and should be set up for this job?<br /> <br /> These and many other questions will be answered by looking at and analyzing examples of real-world problems found on databases of the various RU-net projects.