send zfs snapshot ages to zabbix

#!/usr/bin/ruby

require 'json'

str = `zfs list -t snapshot -o name,creation -H -p`.split("\n")

zabbix_server = "..."
hostname = `hostname`

filesystems = {}
str.each do |line|
  parts = line.split(/\t/)
  n = parts[0].split("@") # Extract the filesystem base name without the snapshot name
  name = n[0]
  filesystems[name] ||= []
  filesystems[name] << parts 
end

zabbix_discovery = {
  :data => []
}

filesystems.each do |name, snapshots|
  zabbix_discovery[:data] << {
    "{#SNAPSHOTNAME}": name
  }
end

puts `zabbix_sender -v -z #{zabbix_server} -k snapshots.discovery_list -o '#{zabbix_discovery.to_json}' -s #{hostname}`


filesystems.each do |name, snapshots|
  ordered = snapshots.sort_by { |x| x[1] }
  age = Time.now.getutc.to_i - ordered.last[1].to_i
  puts "Filesystem #{name} has #{snapshots.length} snapshots. latest snapshot #{ordered.last} is #{age} seconds old"
  `zabbix_sender -v -z #{zabbix_server} -k snapshots.age[#{name}] -o '#{age}' -s #{hostname}`
end