I use node_exporter + VictoriaMetrics + Grafana for network-wide system monitoring. node_exporter also has provisions to include text files placed in a directory you specify, as long as they're written out in the right format. I use that capability on my systems to include some custom metrics, including CPU and memory usage of the top 5 processes on the system, for exactly this reason.
The resulting file looks like:
# HELP cpu_usage CPU usage for top processes in %
# TYPE cpu_usage gauge
cpu_usage{process="/usr/bin/dockerd",pid="187613"} 1.8
cpu_usage{process="/usr/local/bin/python3",pid="190047"} 1.4
cpu_usage{process="/usr/bin/cadvisor",pid="188999"} 1.0
cpu_usage{process="/opt/mealie/bin/python3",pid="190114"} 0.9
cpu_usage{process="/opt/java/openjdk/bin/java",pid="190080"} 0.9
# HELP mem_usage Memory usage for top processes in %
# TYPE mem_usage gauge
mem_usage{process="/usr/local/bin/python3",pid="190047"} 3.0
mem_usage{process="/usr/bin/Xvfb",pid="196573"} 2.4
mem_usage{process="/usr/bin/Xvfb",pid="193606"} 2.4
mem_usage{process="next-server",pid="194634"} 1.2
mem_usage{process="/opt/mealie/bin/python3",pid="190114"} 1.2
And it gets scraped every 15 seconds for all of my systems. The result looks like this for CPU and memory. Pretty boring most of the time, but it can be very valuable to see what was going on with the active processes in the moments leading up to a problem.