Update metrics configuration with new CPU, memory, disk usage, website status, and HTTP request count metrics. Add submetrics for detailed monitoring.

- Update metric type based on definition
- Add detailed description for metric type if defined

.gitignore

@@ -1,4 +1,3 @@
-config.php
+config*.php*
 vendor/
 twig_cache/
-metrics_cache.json

config.example.php

@@ -1,31 +1,94 @@
 <?php
+
 $config = [
-	'app_demo_metric1' => [ // Key is being used a prometheus key
-		'help' => 'Help text for metric',
-		'command' => 'The command to be run',
-		'jsonelem' => '0.metric', // The json element where the metric is found (Dot notated)
-	],
-	'app_demo_metric2' => [ 
-		'help' => 'Help text for metric',
-		'http' => [
-            'url' => 'http://example.com', // The url to get collected for the metric
-            'data' => 'responsebody', // The body is used as output
-        ],
-		'jsonelem' => '0.metric',
-	],
-    'app_demo_metric3' => [
-        'help' => 'Help text for metric',
-        'http' => [
-            'url' => 'http://example.com', // The url to get collected for the metric
-            'data' => 'hasresponse', // If an error occured during request this will return 0, otherwise 1
+    'cpu_usage' => [
+        'help' => 'CPU usage percentage',
+        'type' => 'gauge',
+        'submetrics' => [
+            [
+                'command' => 'top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | awk \'{print 100 - $1}\'',
+            ],
         ],
     ],
-    'app_demo_metric4' => [
-        'help' => 'Help text for metric',
-        'http' => [
-            'url' => 'http://example.com', // The url to get collected for the metric
-            'data' => 'responsetime', // This will return the transfer time
-            'proxy' => 'http://192.168.1.252:8080', // The proxy server the request needs to use
+    'memory_usage' => [
+        'help' => 'Memory usage percentage',
+        'type' => 'gauge',
+        'submetrics' => [
+            [
+                'command' => 'free | grep Mem | awk \'{print $3/$2 * 100.0}\'',
+            ],
         ],
     ],
-];
+    'disk_usage' => [
+        'help' => 'Disk usage percentage',
+        'type' => 'gauge',
+        'submetrics' => [
+            [
+                'command' => 'df -h / | grep / | awk \'{print $5}\' | sed \'s/%//g\'',
+            ],
+        ],
+    ],
+    'website_response_time' => [
+        'help' => 'Response time of example.com in seconds',
+        'type' => 'gauge',
+        'submetrics' => [
+            [
+                'http' => [
+                    'url' => 'http://example.com',
+                    'data' => 'responsetime',
+                ],
+            ],
+        ],
+    ],
+    'website_status' => [
+        'help' => 'HTTP status code of example.com',
+        'type' => 'gauge',
+        'submetrics' => [
+            [
+                'http' => [
+                    'url' => 'http://example.com',
+                    'data' => 'hasresponse',
+                    'statuscode' => [200],
+                ],
+            ],
+        ],
+    ],
+    'http_request_count' => [
+        'help' => 'Number of HTTP requests to example.com',
+        'type' => 'counter',
+        'submetrics' => [
+            [
+                'http' => [
+                    'url' => 'http://example.com',
+                    'data' => 'hasresponse',
+                ],
+            ],
+        ],
+    ],
+    'proxied_request' => [
+        'help' => 'Response time of example.com via proxy in seconds',
+        'type' => 'gauge',
+        'submetrics' => [
+            [
+                'http' => [
+                    'url' => 'http://example.com',
+                    'data' => 'responsetime',
+                    'proxy' => 'http://your-proxy-server:8080',
+                ],
+            ],
+        ],
+    ],
+    'json_data_metric' => [
+        'help' => 'Value from JSON response of example.com',
+        'type' => 'gauge',
+        'submetrics' => [
+            [
+                'http' => [
+                    'url' => 'http://example.com/api/data',
+                    'data' => 'responsebody',
+                ],
+                'jsonelem' => 'path.to.value',  // Adjust the JSON path to the actual structure
+            ],
+        ],
+    ],
+];

index.php

@@ -1,8 +1,16 @@
 <?php
 require 'vendor/autoload.php';
-require 'config.php';
-if(file_exists('metrics_cache.json')) {
-    $oldconfig = json_decode(file_get_contents('metrics_cache.json'), true);
+$configFile = getenv('CONFIG_FILE') ?: 'config.php';
+$cacheFile = $configFile . '.cache.json';
+
+if (file_exists($configFile)) {
+    require ($configFile);
+} else {
+    echo ("Configuration file not found: " . $configFile);
+    exit(1);
+}
+if(file_exists($cacheFile)) {
+    $oldconfig = json_decode(file_get_contents($cacheFile), true);
 } else {
     $oldconfig = [];
 }
@@ -95,7 +103,7 @@ if(php_sapi_name() == 'cli' || $_SERVER["REQUEST_URI"] == '/metrics') {
         }
     }
 
-    file_put_contents('metrics_cache.json', json_encode($config, JSON_PRETTY_PRINT));
+    file_put_contents($cacheFile, json_encode($config, JSON_PRETTY_PRINT));
 
     $loader = new \Twig\Loader\FilesystemLoader('templates');
     $twig = new \Twig\Environment($loader, [

templates/metrics.twig

@@ -2,7 +2,7 @@
 {% if metric.help is defined and metric.help is not empty %}
 # HELP {{ key }} {{ metric.help }}
 {% endif %}
-# TYPE {{ key }} gauge
+# TYPE {{ key }} {% if metric.type is defined and metric.type is not empty %}{{ metric.help }}{% else %}gauge{% endif %}
 {% for subkey, submetric in metric.submetrics %}
 {{ key }}{% if submetric.labels is defined and submetric.labels is not empty %}{{ '{' }}{% for label, value in submetric.labels %}{{ label }}="{{ value }}"{% if not loop.last %},{% endif %}{% endfor %}{{ '}' }}{% endif %} {{ submetric.value }}
 {% endfor %}