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diff --git a/fluent-bit/lib/librdkafka-2.1.0/src/rdhdrhistogram.h b/fluent-bit/lib/librdkafka-2.1.0/src/rdhdrhistogram.h
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+++ b/fluent-bit/lib/librdkafka-2.1.0/src/rdhdrhistogram.h
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+/*
+ * librdkafka - Apache Kafka C library
+ *
+ * Copyright (c) 2018, Magnus Edenhill
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef _RDHDR_HISTOGRAM_H_
+#define _RDHDR_HISTOGRAM_H_
+
+#include <inttypes.h>
+
+
+typedef struct rd_hdr_histogram_s {
+        int64_t lowestTrackableValue;
+        int64_t highestTrackableValue;
+        int64_t unitMagnitude;
+        int64_t significantFigures;
+        int32_t subBucketHalfCountMagnitude;
+        int32_t subBucketHalfCount;
+        int64_t subBucketMask;
+        int32_t subBucketCount;
+        int32_t bucketCount;
+        int32_t countsLen;
+        int64_t totalCount;
+        int64_t *counts;
+        int64_t outOfRangeCount;   /**< Number of rejected records due to
+                                    *   value being out of range. */
+        int64_t lowestOutOfRange;  /**< Lowest value that was out of range.
+                                    *   Initialized to lowestTrackableValue */
+        int64_t highestOutOfRange; /**< Highest value that was out of range.
+                                    *   Initialized to highestTrackableValue */
+        int32_t allocatedSize;     /**< Allocated size of histogram, for
+                                    *   sigfigs tuning. */
+} rd_hdr_histogram_t;
+
+
+#endif /* !_RDHDR_HISTOGRAM_H_ */
+
+
+void rd_hdr_histogram_destroy(rd_hdr_histogram_t *hdr);
+
+/**
+ * @brief Create a new Hdr_Histogram.
+ *
+ * @param significant_figures must be between 1..5
+ *
+ * @returns a newly allocated histogram, or NULL on error.
+ *
+ * @sa rd_hdr_histogram_destroy()
+ */
+rd_hdr_histogram_t *rd_hdr_histogram_new(int64_t minValue,
+                                         int64_t maxValue,
+                                         int significantFigures);
+
+void rd_hdr_histogram_reset(rd_hdr_histogram_t *hdr);
+
+int rd_hdr_histogram_record(rd_hdr_histogram_t *hdr, int64_t v);
+
+double rd_hdr_histogram_stddev(rd_hdr_histogram_t *hdr);
+double rd_hdr_histogram_mean(const rd_hdr_histogram_t *hdr);
+int64_t rd_hdr_histogram_max(const rd_hdr_histogram_t *hdr);
+int64_t rd_hdr_histogram_min(const rd_hdr_histogram_t *hdr);
+int64_t rd_hdr_histogram_quantile(const rd_hdr_histogram_t *hdr, double q);
+
+
+int unittest_rdhdrhistogram(void);