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Munin metric	Comment	Prometheus metric combination	Prometheus comment
Disk
I/Os per device		node_disk_reads_completed_total; node_disk_writes_completed_total	Add derivative to get IOPS
Disk usage in percent (space)		(node_filesystem_size_bytes - node_filesystem_{avail,free}_bytes) / node_filesystem_size_bytes	avail = available to non-root, free = available to root (tune2fs -m / reserved-blocks-percentage)
Disk usage in percent (inodes)		(node_filesystem_files - node_filesystem_files_free) / node_filesystem_files
Utilization per device	is this real ? it could be useful to see if a storage subsystem is overloaded	node_disk_io_time_seconds_total	total time spent in seconds doing IO on the specified device; AFAICT the derivative of this counter is what munin calls "utilization per device"
		node_disk_io_time_weighted_seconds_total	counts the number of seconds spent doing IO multiplied by the number of concurrent IO requests; maybe more relevant ? Docs: https://www.kernel.org/doc/Documentation/iostats.txt
Disk usage in absolute human values.	percentages are meaningless if we resize filesystems	node_filesystem_size_bytes - node_filesystem_{avail,free}_bytes	avail = available to non-root, free = available to root
Networking
eth0 traffic		node_network_receive_bytes_total; node_network_transmit_bytes_total	derivative for bytes per second
		node_network_receive_packets_total; node_network_transmit_packets_total	derivative for packets per second
		node_network_receive_errs_total; node_network_transmit_errs_total	alert if non-zero
Database
			implemented with prometheus-sql-exporter
Postgres replication lag		sql_pg_stat_replication{col=~'(send_lag_bytes,flush_lag_bytes,replay_lag_bytes)'}	replace commas with pipes...
Postgres database size		sql_pg_stat_database{col="dbsize"}
Postgres oldest transaction		sql_pg_stat_activity{col="max_tx_duration"}
Postgres oldest query		?
Postgres scan types (sequential / indexed)		sql_pg_stat_user_tables;sql_pg_statio_user_tables
Postgres wal segments		sql_archive_ready; sql_pg_stat_archiver	use derivative of sql_pg_stat_archiver values to get archival rates
Postgres nb. of transactions		sql_txid	derivative to get tps
System
CPU usage		node_cpu_seconds_total	use derivative for CPU usage
load average		node_load{1,5,15}
Memory usage		node_memory_*
Pending packages		XXX	needs to be implemented with the textfile collector (see /usr/share/doc/prometheus-node-exporter/examples/text_collector_examples/apt.sh)
Swap in/out		node_vmstat_pswpin; node_vmstat_pswpout	unit ?? probably absolute number of pages
Uptime		time() - node_boot_time_seconds
RabbitMQ
			use https://github.com/kbudde/rabbitmq_exporter or https://github.com/deadtrickster/prometheus_rabbitmq_exporter
Consumers
Memory used by queue
Unacknowledged messages
Nb. of connections
Softwareheritage (prado)
Almost everything			integrate to sql-exporter configuration
Most importantly Software Heritage Objects

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