fix: send min and max histogram data (#1766)

Author: rachelyangdog

src/Contrib/Otlp/MetricConverter.php

@@ -204,6 +204,8 @@ private function convertHistogramDataPoint(SDK\Metrics\Data\HistogramDataPoint $
         $pHistogramDataPoint->setTimeUnixNano($dataPoint->timestamp);
         $pHistogramDataPoint->setCount($dataPoint->count);
         $pHistogramDataPoint->setSum($dataPoint->sum);
+        $pHistogramDataPoint->setMin($dataPoint->min);
+        $pHistogramDataPoint->setMax($dataPoint->max);
         $pHistogramDataPoint->setBucketCounts($dataPoint->bucketCounts);
         $pHistogramDataPoint->setExplicitBounds($dataPoint->explicitBounds);
         foreach ($dataPoint->exemplars as $exemplar) {

tests/Unit/Contrib/Otlp/MetricConverterTest.php

@@ -43,7 +43,7 @@ public function test_metrics_are_converted_to_metrics_request(): void
                         {"attributes":[{"key":"foo","value":{"stringValue":"bar"}}],"startTimeUnixNano":"17","timeUnixNano":"42","asInt":"5"}
                     ],"aggregationTemporality":"AGGREGATION_TEMPORALITY_CUMULATIVE"}},
                     {"name":"test-2","histogram":{"dataPoints":[
-                        {"startTimeUnixNano":"17","timeUnixNano":"42","count":"2","sum":7,"bucketCounts":["2", "0"],"explicitBounds":[5]}
+                        {"startTimeUnixNano":"17","timeUnixNano":"42","count":"2","sum":7,"bucketCounts":["2", "0"],"explicitBounds":[5],"min":3,"max":4}
                     ],"aggregationTemporality":"AGGREGATION_TEMPORALITY_DELTA"}},
                     {"name":"test-3","gauge":{"dataPoints":[
                         {"startTimeUnixNano":"17","timeUnixNano":"42","asDouble":9.5}
@@ -122,7 +122,7 @@ public function test_histogram_exemplars_are_converted(): void
             <<<JSON
                 {"resourceMetrics":[{"resource":{},"scopeMetrics":[{"scope":{"name":"test"},"metrics":[
                     {"name":"test-1","histogram":{"dataPoints":[
-                        {"attributes":[{"key":"foo","value":{"stringValue":"bar"}}],"startTimeUnixNano":"17","timeUnixNano":"42","count":"5","sum":9,"bucketCounts":["5"],"exemplars":[
+                        {"attributes":[{"key":"foo","value":{"stringValue":"bar"}}],"startTimeUnixNano":"17","timeUnixNano":"42","count":"5","sum":9,"bucketCounts":["5"],"min":-2,"max":8,"exemplars":[
                             {"filteredAttributes":[{"key":"key","value":{"stringValue":"value"}}],"timeUnixNano":"19","asDouble":0.5},
                             {"filteredAttributes":[{"key":"key","value":{"stringValue":"other"}}],"timeUnixNano":"37","asInt":"-3","spanId":"APBnqgupArc=","traceId":"S/kvNXezTaajzpKdDg5HNg=="}
                         ]}