Systemd service file for cardano-node

[COSDpool]

The discussion of systemd templates has also developed a bit on this page:

Pool maintenance routines

Here are some things I needed to do to feel comfortable taking my eyes off the stake pool node log files every once in a while, after the initial days of staring at them like that creepy guy in The Matrix: Make browser bookmarks to general performance metrics for cloud resources for each node (like DigitalOcean droplet graphs, a bit simple minded but effective; or the AWS CloudWatch pages, not the detailed paid upgrade but just the free ones) to be sure RAM or CPU use isn’t clipping that the m…