Adapt otel exponential histogram data

oap-server/server-receiver-plugin/otel-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/otel/otlp/OpenTelemetryMetricRequestProcessor.java

@@ -187,7 +187,7 @@ private static Map<Double, Long> buildBucketsFromExponentialHistogram(
         final Map<Double, Long> result = new HashMap<>();
         double base = Math.pow(2.0, Math.pow(2.0, -scale));
         if (base == Double.POSITIVE_INFINITY) {
-            if (log.isDebugEnabled()) {
+            if (log.isWarnEnabled()) {
                 log.warn("Receive and reject out-of-range ExponentialHistogram data");
             }
             return result;
@@ -196,7 +196,7 @@ private static Map<Double, Long> buildBucketsFromExponentialHistogram(
         for (int i = 0; i < negativeBucketCounts.size(); i++) {
             upperBound = -Math.pow(base, negativeOffset + i);
             if (upperBound == Double.NEGATIVE_INFINITY) {
-                if (log.isDebugEnabled()) {
+                if (log.isWarnEnabled()) {
                     log.warn("Receive and reject out-of-range ExponentialHistogram data");
                 }
                 break;
@@ -206,7 +206,7 @@ private static Map<Double, Long> buildBucketsFromExponentialHistogram(
         for (int i = 0; i < positiveBucketCounts.size() - 1; i++) {
             upperBound = Math.pow(base, positiveOffset + i + 1);
             if (upperBound == Double.POSITIVE_INFINITY) {
-                if (log.isDebugEnabled()) {
+                if (log.isWarnEnabled()) {
                     log.warn("Receive and reject out-of-range ExponentialHistogram data");
                 }
                 break;