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diff --git a/web/api/formatters/rrd2json.h b/web/api/formatters/rrd2json.h
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+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_RRD2JSON_H
+#define NETDATA_RRD2JSON_H 1
+
+#include "web/api/web_api_v1.h"
+#include "web/api/exporters/allmetrics.h"
+#include "web/api/queries/rrdr.h"
+
+#include "web/api/formatters/csv/csv.h"
+#include "web/api/formatters/ssv/ssv.h"
+#include "web/api/formatters/json/json.h"
+#include "web/api/formatters/value/value.h"
+
+#include "web/api/formatters/rrdset2json.h"
+#include "web/api/formatters/charts2json.h"
+#include "web/api/formatters/json_wrapper.h"
+
+#include "web/server/web_client.h"
+
+#define HOSTNAME_MAX 1024
+
+#define API_RELATIVE_TIME_MAX (3 * 365 * 86400)
+
+// type of JSON generations
+#define DATASOURCE_INVALID (-1)
+#define DATASOURCE_JSON 0
+#define DATASOURCE_DATATABLE_JSON 1
+#define DATASOURCE_DATATABLE_JSONP 2
+#define DATASOURCE_SSV 3
+#define DATASOURCE_CSV 4
+#define DATASOURCE_JSONP 5
+#define DATASOURCE_TSV 6
+#define DATASOURCE_HTML 7
+#define DATASOURCE_JS_ARRAY 8
+#define DATASOURCE_SSV_COMMA 9
+#define DATASOURCE_CSV_JSON_ARRAY 10
+#define DATASOURCE_CSV_MARKDOWN 11
+
+#define DATASOURCE_FORMAT_JSON "json"
+#define DATASOURCE_FORMAT_DATATABLE_JSON "datatable"
+#define DATASOURCE_FORMAT_DATATABLE_JSONP "datasource"
+#define DATASOURCE_FORMAT_JSONP "jsonp"
+#define DATASOURCE_FORMAT_SSV "ssv"
+#define DATASOURCE_FORMAT_CSV "csv"
+#define DATASOURCE_FORMAT_TSV "tsv"
+#define DATASOURCE_FORMAT_HTML "html"
+#define DATASOURCE_FORMAT_JS_ARRAY "array"
+#define DATASOURCE_FORMAT_SSV_COMMA "ssvcomma"
+#define DATASOURCE_FORMAT_CSV_JSON_ARRAY "csvjsonarray"
+#define DATASOURCE_FORMAT_CSV_MARKDOWN "markdown"
+
+extern void rrd_stats_api_v1_chart(RRDSET *st, BUFFER *wb);
+extern void rrdr_buffer_print_format(BUFFER *wb, uint32_t format);
+
+extern int rrdset2anything_api_v1(
+ RRDSET *st
+ , BUFFER *wb
+ , BUFFER *dimensions
+ , uint32_t format
+ , long points
+ , long long after
+ , long long before
+ , int group_method
+ , long group_time
+ , uint32_t options
+ , time_t *latest_timestamp
+ , struct context_param *context_param_list
+ , char *chart_label_key
+);
+
+extern int rrdset2value_api_v1(
+ RRDSET *st
+ , BUFFER *wb
+ , calculated_number *n
+ , const char *dimensions
+ , long points
+ , long long after
+ , long long before
+ , int group_method
+ , long group_time
+ , uint32_t options
+ , time_t *db_after
+ , time_t *db_before
+ , int *value_is_null
+);
+
+extern void build_context_param_list(struct context_param **param_list, RRDSET *st);
+extern void rebuild_context_param_list(struct context_param *context_param_list, time_t after_requested);
+extern void free_context_param_list(struct context_param **param_list);
+
+#endif /* NETDATA_RRD2JSON_H */