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diff --git a/libnetdata/config/appconfig.h b/libnetdata/config/appconfig.h
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+// SPDX-License-Identifier: GPL-3.0-or-later
+
+/*
+ * This section manages ini config files, like netdata.conf and stream.conf
+ *
+ * It is organized like this:
+ *
+ * struct config (i.e. netdata.conf or stream.conf)
+ * .sections = a linked list of struct section
+ * .mutex = a mutex to protect the above linked list due to multi-threading
+ * .index = an AVL tree of struct section
+ *
+ * struct section (i.e. [global] or [health] of netdata.conf)
+ * .value = a linked list of struct config_option
+ * .mutex = a mutex to protect the above linked list due to multi-threading
+ * .value_index = an AVL tree of struct config_option
+ *
+ * struct config_option (ie. a name-value pair for each ini file option)
+ *
+ * The following operations on name-value options are supported:
+ * SET to set the value of an option
+ * SET DEFAULT to set the value and the default value of an option
+ * GET to get the value of an option
+ * EXISTS to check if an option exists
+ * MOVE to move an option from a section to another section, and/or rename it
+ *
+ * GET and SET operations are provided for the following data types:
+ * STRING
+ * NUMBER (long long)
+ * FLOAT (long double)
+ * BOOLEAN (false, true)
+ * BOOLEAN ONDEMAND (false, true, auto)
+ *
+ * GET and SET operations create struct config_option, if it is not already present.
+ * This allows netdata to run even without netdata.conf and stream.conf. The internal
+ * defaults are used to create the structure that should exist in the ini file and the config
+ * file can be downloaded from the server.
+ *
+ * Also 2 operations are supported for the whole config file:
+ *
+ * LOAD To load the ini file from disk
+ * GENERATE To generate the ini file (this is used to download the ini file from the server)
+ *
+ * For each option (name-value pair), the system maintains 4 flags:
+ * LOADED to indicate that the value has been loaded from the file
+ * USED to indicate that netdata used the value
+ * CHANGED to indicate that the value has been changed from the loaded value or the internal default value
+ * CHECKED is used internally for optimization (to avoid an strcmp() every time GET is called).
+ *
+ * TODO:
+ * 1. The linked lists and the mutexes can be removed and the AVL trees can become DICTIONARY.
+ * This part of the code was written before we add traversal to AVL.
+ *
+ * 2. High level data types could be supported, to simplify the rest of the code:
+ * MULTIPLE CHOICE to let the user select one of the supported keywords
+ * this would allow users see in comments the available options
+ *
+ * SIMPLE PATTERN to let the user define netdata SIMPLE PATTERNS
+ *
+ * 3. Sorting of options should be supported.
+ * Today, when the ini file is downloaded from the server, the options are shown in the order
+ * they appear in the linked list (the order they were added, listing changed options first).
+ * If we remove the linked list, the order they appear in the AVL tree will be used (which is
+ * random due to simple_hash()).
+ * Ideally, we support sorting of options when generating the ini file.
+ *
+ * 4. There is no free() operation. So, memory is freed on netdata exit.
+ *
+ * 5. Avoid memory fragmentation
+ * Since entries are created from multiple threads and a lot of allocations are required
+ * for each config_option, fragmentation can be a problem for IoT.
+ *
+ * 6. Although this way of managing options is quite flexible and dynamic, it wastes memory
+ * for the names of the options. Since most of the option names are static, we could provide
+ * a method to allocate only the dynamic option names.
+ */
+
+#ifndef NETDATA_CONFIG_H
+#define NETDATA_CONFIG_H 1
+
+#include "../libnetdata.h"
+
+#define CONFIG_FILENAME "netdata.conf"
+
+#define CONFIG_SECTION_GLOBAL "global"
+#define CONFIG_SECTION_WEB "web"
+#define CONFIG_SECTION_STATSD "statsd"
+#define CONFIG_SECTION_PLUGINS "plugins"
+#define CONFIG_SECTION_CLOUD "cloud"
+#define CONFIG_SECTION_REGISTRY "registry"
+#define CONFIG_SECTION_HEALTH "health"
+#define CONFIG_SECTION_BACKEND "backend"
+#define CONFIG_SECTION_STREAM "stream"
+#define CONFIG_SECTION_EXPORTING "exporting:global"
+#define CONFIG_SECTION_PROMETHEUS "prometheus:exporter"
+#define CONFIG_SECTION_HOST_LABEL "host labels"
+#define EXPORTING_CONF "exporting.conf"
+
+// these are used to limit the configuration names and values lengths
+// they are not enforced by config.c functions (they will strdup() all strings, no matter of their length)
+#define CONFIG_MAX_NAME 1024
+#define CONFIG_MAX_VALUE 2048
+
+// ----------------------------------------------------------------------------
+// Config definitions
+#define CONFIG_FILE_LINE_MAX ((CONFIG_MAX_NAME + CONFIG_MAX_VALUE + 1024) * 2)
+
+#define CONFIG_VALUE_LOADED 0x01 // has been loaded from the config
+#define CONFIG_VALUE_USED 0x02 // has been accessed from the program
+#define CONFIG_VALUE_CHANGED 0x04 // has been changed from the loaded value or the internal default value
+#define CONFIG_VALUE_CHECKED 0x08 // has been checked if the value is different from the default
+
+struct config_option {
+ avl avl_node; // the index entry of this entry - this has to be first!
+
+ uint8_t flags;
+ uint32_t hash; // a simple hash to speed up searching
+ // we first compare hashes, and only if the hashes are equal we do string comparisons
+
+ char *name;
+ char *value;
+
+ struct config_option *next; // config->mutex protects just this
+};
+
+struct section {
+ avl avl_node; // the index entry of this section - this has to be first!
+
+ uint32_t hash; // a simple hash to speed up searching
+ // we first compare hashes, and only if the hashes are equal we do string comparisons
+
+ char *name;
+
+ struct section *next; // gloabl config_mutex protects just this
+
+ struct config_option *values;
+ avl_tree_lock values_index;
+
+ netdata_mutex_t mutex; // this locks only the writers, to ensure atomic updates
+ // readers are protected using the rwlock in avl_tree_lock
+};
+
+struct config {
+ struct section *first_section;
+ struct section *last_section; // optimize inserting at the end
+ netdata_mutex_t mutex;
+ avl_tree_lock index;
+};
+
+#define CONFIG_BOOLEAN_INVALID 100 // an invalid value to check for validity (used as default initialization when needed)
+
+#define CONFIG_BOOLEAN_NO 0 // disabled
+#define CONFIG_BOOLEAN_YES 1 // enabled
+
+#ifndef CONFIG_BOOLEAN_AUTO
+#define CONFIG_BOOLEAN_AUTO 2 // enabled if it has useful info when enabled
+#endif
+
+extern int appconfig_load(struct config *root, char *filename, int overwrite_used, const char *section_name);
+extern void config_section_wrlock(struct section *co);
+extern void config_section_unlock(struct section *co);
+
+extern char *appconfig_get_by_section(struct section *co, const char *name, const char *default_value);
+extern char *appconfig_get(struct config *root, const char *section, const char *name, const char *default_value);
+extern long long appconfig_get_number(struct config *root, const char *section, const char *name, long long value);
+extern LONG_DOUBLE appconfig_get_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value);
+extern int appconfig_get_boolean_by_section(struct section *co, const char *name, int value);
+extern int appconfig_get_boolean(struct config *root, const char *section, const char *name, int value);
+extern int appconfig_get_boolean_ondemand(struct config *root, const char *section, const char *name, int value);
+extern int appconfig_get_duration(struct config *root, const char *section, const char *name, const char *value);
+
+extern const char *appconfig_set(struct config *root, const char *section, const char *name, const char *value);
+extern const char *appconfig_set_default(struct config *root, const char *section, const char *name, const char *value);
+extern long long appconfig_set_number(struct config *root, const char *section, const char *name, long long value);
+extern LONG_DOUBLE appconfig_set_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value);
+extern int appconfig_set_boolean(struct config *root, const char *section, const char *name, int value);
+
+extern int appconfig_exists(struct config *root, const char *section, const char *name);
+extern int appconfig_move(struct config *root, const char *section_old, const char *name_old, const char *section_new, const char *name_new);
+
+extern void appconfig_generate(struct config *root, BUFFER *wb, int only_changed);
+
+extern int appconfig_section_compare(void *a, void *b);
+
+extern void appconfig_section_destroy_non_loaded(struct config *root, const char *section);
+
+extern int config_parse_duration(const char* string, int* result);
+
+extern struct section *appconfig_get_section(struct config *root, const char *name);
+
+extern void appconfig_wrlock(struct config *root);
+extern void appconfig_unlock(struct config *root);
+
+struct connector_instance {
+ char instance_name[CONFIG_MAX_NAME + 1];
+ char connector_name[CONFIG_MAX_NAME + 1];
+};
+
+typedef struct _connector_instance {
+ struct section *connector; // actual connector
+ struct section *instance; // This instance
+ char instance_name[CONFIG_MAX_NAME + 1];
+ char connector_name[CONFIG_MAX_NAME + 1];
+ struct _connector_instance *next; // Next instance
+} _CONNECTOR_INSTANCE;
+
+extern _CONNECTOR_INSTANCE *add_connector_instance(struct section *connector, struct section *instance);
+
+#endif /* NETDATA_CONFIG_H */