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diff --git a/libnetdata/log/log.h b/libnetdata/log/log.h
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+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_LOG_H
+#define NETDATA_LOG_H 1
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+#include "../libnetdata.h"
+
+#define ND_LOG_DEFAULT_THROTTLE_LOGS 1000
+#define ND_LOG_DEFAULT_THROTTLE_PERIOD 60
+
+typedef enum __attribute__((__packed__)) {
+ NDLS_UNSET = 0, // internal use only
+ NDLS_ACCESS, // access.log
+ NDLS_ACLK, // aclk.log
+ NDLS_COLLECTORS, // collectors.log
+ NDLS_DAEMON, // error.log
+ NDLS_HEALTH, // health.log
+ NDLS_DEBUG, // debug.log
+
+ // terminator
+ _NDLS_MAX,
+} ND_LOG_SOURCES;
+
+typedef enum __attribute__((__packed__)) {
+ NDLP_EMERG = LOG_EMERG,
+ NDLP_ALERT = LOG_ALERT,
+ NDLP_CRIT = LOG_CRIT,
+ NDLP_ERR = LOG_ERR,
+ NDLP_WARNING = LOG_WARNING,
+ NDLP_NOTICE = LOG_NOTICE,
+ NDLP_INFO = LOG_INFO,
+ NDLP_DEBUG = LOG_DEBUG,
+} ND_LOG_FIELD_PRIORITY;
+
+typedef enum __attribute__((__packed__)) {
+ // KEEP THESE IN THE SAME ORDER AS in thread_log_fields (log.c)
+ // so that it easy to audit for missing fields
+
+ NDF_STOP = 0,
+ NDF_TIMESTAMP_REALTIME_USEC, // the timestamp of the log message - added automatically
+ NDF_SYSLOG_IDENTIFIER, // the syslog identifier of the application - added automatically
+ NDF_LOG_SOURCE, // DAEMON, COLLECTORS, HEALTH, ACCESS, ACLK - set at the log call
+ NDF_PRIORITY, // the syslog priority (severity) - set at the log call
+ NDF_ERRNO, // the ERRNO at the time of the log call - added automatically
+ NDF_INVOCATION_ID, // the INVOCATION_ID of Netdata - added automatically
+ NDF_LINE, // the source code file line number - added automatically
+ NDF_FILE, // the source code filename - added automatically
+ NDF_FUNC, // the source code function - added automatically
+ NDF_TID, // the thread ID of the thread logging - added automatically
+ NDF_THREAD_TAG, // the thread tag of the thread logging - added automatically
+ NDF_MESSAGE_ID, // for specific events
+ NDF_MODULE, // for internal plugin module, all other get the NDF_THREAD_TAG
+
+ NDF_NIDL_NODE, // the node / rrdhost currently being worked
+ NDF_NIDL_INSTANCE, // the instance / rrdset currently being worked
+ NDF_NIDL_CONTEXT, // the context of the instance currently being worked
+ NDF_NIDL_DIMENSION, // the dimension / rrddim currently being worked
+
+ // web server, aclk and stream receiver
+ NDF_SRC_TRANSPORT, // the transport we received the request, one of: http, https, pluginsd
+
+ // web server and stream receiver
+ NDF_SRC_IP, // the streaming / web server source IP
+ NDF_SRC_PORT, // the streaming / web server source Port
+ NDF_SRC_CAPABILITIES, // the stream receiver capabilities
+
+ // stream sender (established links)
+ NDF_DST_TRANSPORT, // the transport we send the request, one of: http, https
+ NDF_DST_IP, // the destination streaming IP
+ NDF_DST_PORT, // the destination streaming Port
+ NDF_DST_CAPABILITIES, // the destination streaming capabilities
+
+ // web server, aclk and stream receiver
+ NDF_REQUEST_METHOD, // for http like requests, the http request method
+ NDF_RESPONSE_CODE, // for http like requests, the http response code, otherwise a status string
+
+ // web server (all), aclk (queries)
+ NDF_CONNECTION_ID, // the web server connection ID
+ NDF_TRANSACTION_ID, // the web server and API transaction ID
+ NDF_RESPONSE_SENT_BYTES, // for http like requests, the response bytes
+ NDF_RESPONSE_SIZE_BYTES, // for http like requests, the uncompressed response size
+ NDF_RESPONSE_PREPARATION_TIME_USEC, // for http like requests, the preparation time
+ NDF_RESPONSE_SENT_TIME_USEC, // for http like requests, the time to send the response back
+ NDF_RESPONSE_TOTAL_TIME_USEC, // for http like requests, the total time to complete the response
+
+ // health alerts
+ NDF_ALERT_ID,
+ NDF_ALERT_UNIQUE_ID,
+ NDF_ALERT_EVENT_ID,
+ NDF_ALERT_TRANSITION_ID,
+ NDF_ALERT_CONFIG_HASH,
+ NDF_ALERT_NAME,
+ NDF_ALERT_CLASS,
+ NDF_ALERT_COMPONENT,
+ NDF_ALERT_TYPE,
+ NDF_ALERT_EXEC,
+ NDF_ALERT_RECIPIENT,
+ NDF_ALERT_DURATION,
+ NDF_ALERT_VALUE,
+ NDF_ALERT_VALUE_OLD,
+ NDF_ALERT_STATUS,
+ NDF_ALERT_STATUS_OLD,
+ NDF_ALERT_SOURCE,
+ NDF_ALERT_UNITS,
+ NDF_ALERT_SUMMARY,
+ NDF_ALERT_INFO,
+ NDF_ALERT_NOTIFICATION_REALTIME_USEC,
+ // NDF_ALERT_FLAGS,
+
+ // put new items here
+ // leave the request URL and the message last
+
+ NDF_REQUEST, // the request we are currently working on
+ NDF_MESSAGE, // the log message, if any
+
+ // terminator
+ _NDF_MAX,
+} ND_LOG_FIELD_ID;
+
+typedef enum __attribute__((__packed__)) {
+ NDFT_UNSET = 0,
+ NDFT_TXT,
+ NDFT_STR,
+ NDFT_BFR,
+ NDFT_U64,
+ NDFT_I64,
+ NDFT_DBL,
+ NDFT_UUID,
+ NDFT_CALLBACK,
+} ND_LOG_STACK_FIELD_TYPE;
+
+void nd_log_set_user_settings(ND_LOG_SOURCES source, const char *setting);
+void nd_log_set_facility(const char *facility);
+void nd_log_set_priority_level(const char *setting);
+void nd_log_initialize(void);
+void nd_log_reopen_log_files(void);
+void chown_open_file(int fd, uid_t uid, gid_t gid);
+void nd_log_chown_log_files(uid_t uid, gid_t gid);
+void nd_log_set_flood_protection(size_t logs, time_t period);
+void nd_log_initialize_for_external_plugins(const char *name);
+void nd_log_set_thread_source(ND_LOG_SOURCES source);
+bool nd_log_journal_socket_available(void);
+ND_LOG_FIELD_ID nd_log_field_id_by_name(const char *field, size_t len);
+int nd_log_priority2id(const char *priority);
+const char *nd_log_id2priority(ND_LOG_FIELD_PRIORITY priority);
+const char *nd_log_method_for_external_plugins(const char *s);
+
+int nd_log_health_fd(void);
+typedef bool (*log_formatter_callback_t)(BUFFER *wb, void *data);
+
+struct log_stack_entry {
+ ND_LOG_FIELD_ID id;
+ ND_LOG_STACK_FIELD_TYPE type;
+ bool set;
+ union {
+ const char *txt;
+ struct netdata_string *str;
+ BUFFER *bfr;
+ uint64_t u64;
+ int64_t i64;
+ double dbl;
+ const uuid_t *uuid;
+ struct {
+ log_formatter_callback_t formatter;
+ void *formatter_data;
+ } cb;
+ };
+};
+
+#define ND_LOG_STACK _cleanup_(log_stack_pop) struct log_stack_entry
+#define ND_LOG_STACK_PUSH(lgs) log_stack_push(lgs)
+
+#define ND_LOG_FIELD_TXT(field, value) (struct log_stack_entry){ .id = (field), .type = NDFT_TXT, .txt = (value), .set = true, }
+#define ND_LOG_FIELD_STR(field, value) (struct log_stack_entry){ .id = (field), .type = NDFT_STR, .str = (value), .set = true, }
+#define ND_LOG_FIELD_BFR(field, value) (struct log_stack_entry){ .id = (field), .type = NDFT_BFR, .bfr = (value), .set = true, }
+#define ND_LOG_FIELD_U64(field, value) (struct log_stack_entry){ .id = (field), .type = NDFT_U64, .u64 = (value), .set = true, }
+#define ND_LOG_FIELD_I64(field, value) (struct log_stack_entry){ .id = (field), .type = NDFT_I64, .i64 = (value), .set = true, }
+#define ND_LOG_FIELD_DBL(field, value) (struct log_stack_entry){ .id = (field), .type = NDFT_DBL, .dbl = (value), .set = true, }
+#define ND_LOG_FIELD_CB(field, func, data) (struct log_stack_entry){ .id = (field), .type = NDFT_CALLBACK, .cb = { .formatter = (func), .formatter_data = (data) }, .set = true, }
+#define ND_LOG_FIELD_UUID(field, value) (struct log_stack_entry){ .id = (field), .type = NDFT_UUID, .uuid = (value), .set = true, }
+#define ND_LOG_FIELD_END() (struct log_stack_entry){ .id = NDF_STOP, .type = NDFT_UNSET, .set = false, }
+
+void log_stack_pop(void *ptr);
+void log_stack_push(struct log_stack_entry *lgs);
+
+#define D_WEB_BUFFER 0x0000000000000001
+#define D_WEB_CLIENT 0x0000000000000002
+#define D_LISTENER 0x0000000000000004
+#define D_WEB_DATA 0x0000000000000008
+#define D_OPTIONS 0x0000000000000010
+#define D_PROCNETDEV_LOOP 0x0000000000000020
+#define D_RRD_STATS 0x0000000000000040
+#define D_WEB_CLIENT_ACCESS 0x0000000000000080
+#define D_TC_LOOP 0x0000000000000100
+#define D_DEFLATE 0x0000000000000200
+#define D_CONFIG 0x0000000000000400
+#define D_PLUGINSD 0x0000000000000800
+#define D_CHILDS 0x0000000000001000
+#define D_EXIT 0x0000000000002000
+#define D_CHECKS 0x0000000000004000
+#define D_NFACCT_LOOP 0x0000000000008000
+#define D_PROCFILE 0x0000000000010000
+#define D_RRD_CALLS 0x0000000000020000
+#define D_DICTIONARY 0x0000000000040000
+#define D_MEMORY 0x0000000000080000
+#define D_CGROUP 0x0000000000100000
+#define D_REGISTRY 0x0000000000200000
+#define D_VARIABLES 0x0000000000400000
+#define D_HEALTH 0x0000000000800000
+#define D_CONNECT_TO 0x0000000001000000
+#define D_RRDHOST 0x0000000002000000
+#define D_LOCKS 0x0000000004000000
+#define D_EXPORTING 0x0000000008000000
+#define D_STATSD 0x0000000010000000
+#define D_POLLFD 0x0000000020000000
+#define D_STREAM 0x0000000040000000
+#define D_ANALYTICS 0x0000000080000000
+#define D_RRDENGINE 0x0000000100000000
+#define D_ACLK 0x0000000200000000
+#define D_REPLICATION 0x0000002000000000
+#define D_SYSTEM 0x8000000000000000
+
+extern uint64_t debug_flags;
+
+extern const char *program_name;
+
+#ifdef ENABLE_ACLK
+extern int aclklog_enabled;
+#endif
+
+#define LOG_DATE_LENGTH 26
+void log_date(char *buffer, size_t len, time_t now);
+
+static inline void debug_dummy(void) {}
+
+void nd_log_limits_reset(void);
+void nd_log_limits_unlimited(void);
+
+#define NDLP_INFO_STR "info"
+
+#ifdef NETDATA_INTERNAL_CHECKS
+#define netdata_log_debug(type, args...) do { if(unlikely(debug_flags & type)) netdata_logger(NDLS_DEBUG, NDLP_DEBUG, __FILE__, __FUNCTION__, __LINE__, ##args); } while(0)
+#define internal_error(condition, args...) do { if(unlikely(condition)) netdata_logger(NDLS_DAEMON, NDLP_DEBUG, __FILE__, __FUNCTION__, __LINE__, ##args); } while(0)
+#define internal_fatal(condition, args...) do { if(unlikely(condition)) netdata_logger_fatal(__FILE__, __FUNCTION__, __LINE__, ##args); } while(0)
+#else
+#define netdata_log_debug(type, args...) debug_dummy()
+#define internal_error(args...) debug_dummy()
+#define internal_fatal(args...) debug_dummy()
+#endif
+
+#define fatal(args...) netdata_logger_fatal(__FILE__, __FUNCTION__, __LINE__, ##args)
+#define fatal_assert(expr) ((expr) ? (void)(0) : netdata_logger_fatal(__FILE__, __FUNCTION__, __LINE__, "Assertion `%s' failed", #expr))
+
+// ----------------------------------------------------------------------------
+// normal logging
+
+void netdata_logger(ND_LOG_SOURCES source, ND_LOG_FIELD_PRIORITY priority, const char *file, const char *function, unsigned long line, const char *fmt, ... ) PRINTFLIKE(6, 7);
+#define nd_log(NDLS, NDLP, args...) netdata_logger(NDLS, NDLP, __FILE__, __FUNCTION__, __LINE__, ##args)
+#define nd_log_daemon(NDLP, args...) netdata_logger(NDLS_DAEMON, NDLP, __FILE__, __FUNCTION__, __LINE__, ##args)
+#define nd_log_collector(NDLP, args...) netdata_logger(NDLS_COLLECTORS, NDLP, __FILE__, __FUNCTION__, __LINE__, ##args)
+
+#define netdata_log_info(args...) netdata_logger(NDLS_DAEMON, NDLP_INFO, __FILE__, __FUNCTION__, __LINE__, ##args)
+#define netdata_log_error(args...) netdata_logger(NDLS_DAEMON, NDLP_ERR, __FILE__, __FUNCTION__, __LINE__, ##args)
+#define collector_info(args...) netdata_logger(NDLS_COLLECTORS, NDLP_INFO, __FILE__, __FUNCTION__, __LINE__, ##args)
+#define collector_error(args...) netdata_logger(NDLS_COLLECTORS, NDLP_ERR, __FILE__, __FUNCTION__, __LINE__, ##args)
+
+#define log_aclk_message_bin(__data, __data_len, __tx, __mqtt_topic, __message_name) \
+ nd_log(NDLS_ACLK, NDLP_INFO, \
+ "direction:%s message:'%s' topic:'%s' json:'%.*s'", \
+ (__tx) ? "OUTGOING" : "INCOMING", __message_name, __mqtt_topic, (int)(__data_len), __data)
+
+// ----------------------------------------------------------------------------
+// logging with limits
+
+typedef struct error_with_limit {
+ SPINLOCK spinlock;
+ time_t log_every;
+ size_t count;
+ time_t last_logged;
+ usec_t sleep_ut;
+} ERROR_LIMIT;
+
+#define nd_log_limit_static_global_var(var, log_every_secs, sleep_usecs) static ERROR_LIMIT var = { .last_logged = 0, .count = 0, .log_every = (log_every_secs), .sleep_ut = (sleep_usecs) }
+#define nd_log_limit_static_thread_var(var, log_every_secs, sleep_usecs) static __thread ERROR_LIMIT var = { .last_logged = 0, .count = 0, .log_every = (log_every_secs), .sleep_ut = (sleep_usecs) }
+void netdata_logger_with_limit(ERROR_LIMIT *erl, ND_LOG_SOURCES source, ND_LOG_FIELD_PRIORITY priority, const char *file, const char *function, unsigned long line, const char *fmt, ... ) PRINTFLIKE(7, 8);;
+#define nd_log_limit(erl, NDLS, NDLP, args...) netdata_logger_with_limit(erl, NDLS, NDLP, __FILE__, __FUNCTION__, __LINE__, ##args)
+
+// ----------------------------------------------------------------------------
+
+void send_statistics(const char *action, const char *action_result, const char *action_data);
+void netdata_logger_fatal( const char *file, const char *function, unsigned long line, const char *fmt, ... ) NORETURN PRINTFLIKE(4, 5);
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif /* NETDATA_LOG_H */