Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

** See the GNU Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#ifndef ZABBIX_ZBXTRENDS_H

#define ZABBIX_ZBXTRENDS_H

​

#include "zbxeval.h"

#include "zbxtime.h"

​

/* value_avg_t structure is used for item average value trend calculations. */

/*                                                                          */

/* For double values the average value is calculated on the fly with the    */

/* following formula: avg = (dbl * count + value) / (count + 1) and stored  */

/* into dbl member.                                                         */

/* For uint64 values the item values are summed into ui64 member and the    */

/* average value is calculated before flushing trends to database:          */

/* avg = ui64 / count                                                       */

typedef union

{

    double      dbl;

    zbx_uint128_t   ui64;

}

zbx_value_avg_t;

​

typedef struct

{

    zbx_uint64_t        itemid;

    zbx_history_value_t value_min;

    zbx_value_avg_t     value_avg;

    zbx_history_value_t value_max;

    int         clock;

    int         num;

    int         disable_from;

    unsigned char       value_type;

}

ZBX_DC_TREND;

​

int zbx_trends_parse_base(const char *params, zbx_time_unit_t *base, char **error);

int zbx_trends_parse_timeshift(time_t from, const char *timeshift, struct tm *tm, char **error);

​

int zbx_trends_parse_range(time_t from, const char *param, time_t *start, time_t *end, char **error);

int zbx_trends_parse_nextcheck(time_t from, const char *period_shift, time_t *nextcheck, char **error);

​

int zbx_trends_eval_avg(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,

        char **error);

int zbx_trends_eval_count(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,

        char **error);

int zbx_trends_eval_max(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,

        char **error);

int zbx_trends_eval_min(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,

        char **error);

int zbx_trends_eval_sum(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,