[RADIATOR] Prometheus statistics output

[Tarko Tikan]

hey,

Resurrecting old thread about native Prometheus metrics directly from 
Radiator. Did some digging in the source and "creative use of game 
mechanics" type of solution I came up with is following:

<ServerHTTP>
   PageNotFoundHook file:"stats.pl"
</ServerHTTP>

sub {
   my $uri = $_[0];

   if($uri !~ /^\/metrics$/) {
     return;
   }

   my $stats;
   foreach (sort keys %Radius::ServerConfig::statistic_names)
   {
     my $name = "radiator_$_";
     my $value = $main::config->{Statistics}{$_};
     my $help = $Radius::ServerConfig::statistic_names{$_};
     $stats .= sprintf "# HELP %s %s\n", $name, $help;
     $stats .= sprintf "%s %f\n", $name, $value;
   }

   return (200, $stats);
}

I'm not sure it's ment to be used this way but it works and is not 
horrible at all. I don't see any obvious drawbacks why it shouldn't be 
used, just have to check for any security implications of enabling 
ServerHTTP.

-- 
tarko