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Monitor the health of your node
The most important thing for the the health, performance and stablity of your node and the overall network is the strength of your node's network connectivity / peer count.
See here for our networking related tips and tricks.
Keep track of your attestation effectiveness
Attestation effectiveness is a metric that directly affects your validator rewards. In simple terms, an attestation is more valuable the sooner it is put into a block and included in the chain.
This interval is called the inclusion distance of an attestation. The smaller it is, the more profitable your validator will be. For a deeper understanding we highly recommend reading Attestant's wonderful blog post on the matter.
You can verify your validator's effectiveness on the beaconcha.in website.
Ideally you want to see a value above 80%.
While attestation effectiveness depends on a variety of factors - attestation network propagation, your network connectivity, and the peers you are connected to - your network connectivity is likely the most important factors you can control to improve this metric. Apart from the tips outlined on this guide, you could also experiment with subscribing to all subnets.
Monitor your system's network I/O usage
If you're a Linux user and want to track how much network I/O your system uses over time, you can install a nice utility called vnstat.
To install, run:
sudo apt install vnstat
To run it:
TBC -See here for more