MXS-1632: Remove the unused statistics code

The statistics code was almost completely unused.

include/maxscale/statistics.h

@@ -1,101 +0,0 @@
-/*
- * Copyright (c) 2018 MariaDB Corporation Ab
- *
- * Use of this software is governed by the Business Source License included
- * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
- *
- * Change Date: 2022-01-01
- *
- * On the date above, in accordance with the Business Source License, use
- * of this software will be governed by version 2 or later of the General
- * Public License.
- */
-#pragma once
-
-/**
- * @file statistics.h  - Lock-free statistics gathering
- */
-
-#include <maxscale/cdefs.h>
-#include <stdint.h>
-
-MXS_BEGIN_DECLS
-
-typedef void* ts_stats_t;
-
-/** Enum values for ts_stats_get */
-enum ts_stats_type
-{
-    TS_STATS_MAX,   /**< Maximum value */
-    TS_STATS_MIX,   /**< Minimum value */
-    TS_STATS_SUM,   /**< Sum of all value */
-    TS_STATS_AVG    /**< Average of all values */
-};
-
-/**
- * @brief Allocate a new statistics object
- *
- * @return New statistics object or NULL if memory allocation failed
- */
-ts_stats_t ts_stats_alloc();
-
-/**
- * @brief Free statistics
- *
- * @param stats Statistics to free
- */
-void ts_stats_free(ts_stats_t stats);
-
-/**
- * @brief Get statistics
- *
- * @param stats Statistics to read
- * @param type Type of statistics to get
- * @return Statistics value
- *
- * @see enum ts_stats_type
- */
-int64_t ts_stats_get(ts_stats_t stats, enum ts_stats_type type);
-
-/**
- * @brief Increment thread statistics by one
- *
- * @param stats     Statistics to add to
- * @param thread_id ID of thread
- */
-void ts_stats_increment(ts_stats_t stats, int thread_id);
-
-/**
- * @brief Assign a value to a statistics element
- *
- * This sets the value for the specified thread.
- *
- * @param stats     Statistics to set
- * @param value     Value to set to
- * @param thread_id ID of thread
- */
-void ts_stats_set(ts_stats_t stats, int value, int thread_id);
-
-/**
- * @brief Assign the maximum value to a statistics element
- *
- * This sets the value for the specified thread if the current value is smaller.
- *
- * @param stats     Statistics to set
- * @param value     Value to set to
- * @param thread_id ID of thread
- */
-void ts_stats_set_max(ts_stats_t stats, int value, int thread_id);
-
-/**
- * @brief Assign the minimum value to a statistics element
- *
- * This sets the value for the specified thread if the current value is larger.
- *
- * @param stats     Statistics to set
- * @param value     Value to set to
- * @param thread_id ID of thread
- */
-void ts_stats_set_min(ts_stats_t stats, int value, int thread_id);
-
-MXS_END_DECLS

include/maxscale/statistics.hh

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2018 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
+ *
+ * Change Date: 2022-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+#pragma once
+
+#include <maxscale/ccdefs.hh>
+
+enum ts_stats_type
+{
+    TS_STATS_MAX, /**< Maximum value */
+    TS_STATS_MIX, /**< Minimum value */
+    TS_STATS_SUM, /**< Sum of all value */
+    TS_STATS_AVG  /**< Average of all values */
+};