Get "oldest" system from service (go template, consul template) based on unix time in kv

ctmpl

{{/* get unix times for systems in service group */}}
{{range ls "mykv/myservice"}}
    {{ $int := .Value | parseInt}}
    {{ scratch.MapSetX "nodetimes" .Key $int}}{{ end }}
{{/* create map of names */}}
{{ range service "myservice|passing" }}
    {{ $node := .Node }}
    {{ scratch.MapSetX "names" $node $node }}{{ end }}
{{/* create map of time differences from "now" for each server */}}
{{ range $hkey, $hval := scratch.Get "nodetimes" }}
    {{ range $key, $val := scratch.Get "nodetimes" }}
        {{ if eq $key $hkey}}
            {{ $current_time := timestamp "unix" | parseInt }}
            {{ $time_diff := $current_time | subtract $val}}
            {{ $combine := (printf "%v@%v" $time_diff $hkey) }}
            {{ scratch.MapSetX "names_final" $combine $combine}}{{end}}{{end}}{{end}}
{{ range $index, $key := scratch.MapValues "names_final" }}
    {{ if eq $index 0}}
        {{$key_array := $key | split "@" }}
        {{ $system_name := index $key_array 1}}
        {{ if eq $system_name "myfqdn"}}
        {{ $system_name }}-global{{end}}{{end}}{{end}}