hddtemp_smartctl: configure warning and critical temps per device

this is useful if you have a mix of drives in the system
(e.g. HDD + SSD) that have different temperature limits

plugins/node.d/hddtemp_smartctl

@@ -15,16 +15,20 @@ the harddrive devices.
 
 The following environment variables are used
 
- smartctl  - path to smartctl executable
- drives	   - List drives to monitor. E.g. "env.drives hda hdc".
- type_$dev - device type for one drive, e.g. "env.type_sda 3ware,0"
-             or more typically "env.type_sda ata" if sda is a SATA disk.
- args_$dev - additional arguments to smartctl for one drive,
-             e.g. "env.args_hda -v 194,10xCelsius".  Use this to make
-             the plugin use the --all or -a option if your disk will
-             not return its temperature when only the -A option is
-             used.
- dev_$dev  - monitoring device for one drive, e.g. twe0
+ smartctl      - path to smartctl executable
+ drives	       - List drives to monitor. E.g. "env.drives hda hdc".
+ type_$dev     - device type for one drive, e.g. "env.type_sda 3ware,0"
+                 or more typically "env.type_sda ata" if sda is a SATA disk.
+ args_$dev     - additional arguments to smartctl for one drive,
+                 e.g. "env.args_hda -v 194,10xCelsius".  Use this to make
+                 the plugin use the --all or -a option if your disk will
+                 not return its temperature when only the -A option is
+                 used.
+ dev_$dev      - monitoring device for one drive, e.g. twe0
+ $dev.warning  - set warning temperature for $dev, default 57 (°C)
+                 e.g. "env.nvme0n1.warning 70"
+ $dev.critical - set critical temperature for $dev, default 60 (°C),
+                 e.g. "env.nvme0n1.critical 80"
 
 If the "smartctl" environment variable is not set the plugin will
 search your $PATH, /usr/bin, /usr/sbin, /usr/local/bin and
@@ -46,6 +50,9 @@ All rights reserved.
 2016-08-27, Gabriele Pohl ([email protected])
 Fix for github issue #690
 
+2023-07-23, Andreas Perhab, WT-IO-IT GmbH
+enable configuring warning and critical temps
+
 =head1 LICENSE
 
 Redistribution and use in source and binary forms, with or without
@@ -227,8 +234,16 @@ if (defined $ARGV[0]) {
         my @dirs = splitdir($_);
         print $d . ".label " . $dirs[-1] . "\n";
         print $d . ".max 100\n";
-        print $d . ".warning 57\n";
-        print $d . ".critical 60\n";
+        my $warning = "57";
+        if (defined($ENV{clean_fieldname($_) . ".warning"})) {
+            $warning = $ENV{clean_fieldname($_) . ".warning"};
+        }
+        print clean_fieldname($_) . ".warning $warning\n";
+        my $critical = "60";
+        if (defined($ENV{clean_fieldname($_) . ".critical"})) {
+            $critical = $ENV{clean_fieldname($_) . ".critical"};
+        }
+        print clean_fieldname($_) . ".critical $critical\n";
         my $id = get_drive_id($_, device_for_drive($_), $use_nocheck);
         print $d . ".info $id\n";
     }