Michael Schiemer
55a330b223
- Add DISCOVERY_LOG_LEVEL=debug - Add DISCOVERY_SHOW_PROGRESS=true - Temporary changes for debugging InitializerProcessor fixes on production
127 lines
3.7 KiB
PHP
127 lines
3.7 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Framework\Metrics\Formatters;
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use App\Framework\Metrics\Metric;
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use App\Framework\Metrics\MetricsCollection;
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use App\Framework\Metrics\MetricSuffix;
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use App\Framework\Metrics\MetricType;
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/**
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* Formats metrics in OpenMetrics format
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* OpenMetrics is a CNCF standard that extends Prometheus format
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* @see https://openmetrics.io/
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*/
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final readonly class OpenMetricsFormatter implements MetricsFormatter
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{
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public function format(MetricsCollection $metrics): string
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{
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$output = [];
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$processedMetrics = [];
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foreach ($metrics->getMetrics() as $metricName => $metricGroup) {
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// Skip if already processed
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if (isset($processedMetrics[$metricName])) {
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continue;
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}
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$firstMetric = $metricGroup[0];
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$baseName = MetricSuffix::getBaseName($metricName);
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// HELP line (required in OpenMetrics)
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$help = $firstMetric->help ?? 'No description provided';
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$output[] = sprintf('# HELP %s %s', $baseName, $help);
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// TYPE line (required in OpenMetrics)
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$type = $this->determineMetricType($metricName, $firstMetric->type);
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$output[] = sprintf('# TYPE %s %s', $baseName, $type->value);
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// UNIT line (OpenMetrics specific, optional)
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if ($firstMetric->unit !== null) {
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$output[] = sprintf('# UNIT %s %s', $baseName, $firstMetric->unit);
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}
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// Add metric values
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foreach ($metricGroup as $metric) {
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$output[] = $this->formatMetric($metric);
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}
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$processedMetrics[$metricName] = true;
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// Mark related metrics as processed
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if ($type === MetricType::HISTOGRAM) {
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foreach (MetricSuffix::histogramSuffixes() as $suffix) {
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$processedMetrics[$suffix->addTo($baseName)] = true;
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}
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}
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}
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// OpenMetrics requires EOF marker
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$output[] = '# EOF';
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return implode("\n", $output) . "\n";
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}
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private function formatMetric(Metric $metric): string
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{
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$labels = $metric->getFormattedLabels();
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$name = $metric->name;
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// OpenMetrics doesn't append unit to metric name (uses UNIT metadata instead)
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$line = sprintf('%s%s %s', $name, $labels, $this->formatValue($metric->value));
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// Add timestamp if present (seconds with fractional part for OpenMetrics)
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if ($metric->timestamp !== null) {
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$line .= ' ' . number_format($metric->timestamp->toFloat(), 3, '.', '');
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}
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return $line;
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}
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private function formatValue(float $value): string
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{
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// Handle special float values (OpenMetrics spec)
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if (is_infinite($value)) {
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return $value > 0 ? '+Inf' : '-Inf';
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}
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if (is_nan($value)) {
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return 'NaN';
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}
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// Use scientific notation for very large/small numbers
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if (abs($value) >= 1e10 || (abs($value) < 1e-10 && $value != 0)) {
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return sprintf('%e', $value);
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}
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// Regular formatting
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$formatted = sprintf('%.10f', $value);
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$formatted = rtrim($formatted, '0');
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$formatted = rtrim($formatted, '.');
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return $formatted;
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}
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private function determineMetricType(string $name, MetricType $type): MetricType
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{
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if (MetricSuffix::hasHistogramSuffix($name)) {
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return MetricType::HISTOGRAM;
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}
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return $type;
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}
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public function getContentType(): string
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{
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return 'application/openmetrics-text; version=1.0.0; charset=utf-8';
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}
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public function getName(): string
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{
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return 'openmetrics';
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}
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}
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