Merging upstream version 1.46.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 0 insertions, 2923 deletions

diff --git a/libnetdata/facets/Makefile.am b/libnetdata/facets/Makefile.am
deleted file mode 100644
index 161784b8f..000000000
--- a/libnetdata/facets/Makefile.am
+++ /dev/null
@@ -1,8 +0,0 @@
-# SPDX-License-Identifier: GPL-3.0-or-later
-
-AUTOMAKE_OPTIONS = subdir-objects
-MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
-
-dist_noinst_DATA = \
-    README.md \
-    $(NULL)
diff --git a/libnetdata/facets/README.md b/libnetdata/facets/README.md
deleted file mode 100644
index e69de29bb..000000000
--- a/libnetdata/facets/README.md
+++ /dev/null
diff --git a/libnetdata/facets/facets.c b/libnetdata/facets/facets.c
deleted file mode 100644
index 4a5f5442b..000000000
--- a/libnetdata/facets/facets.c
+++ /dev/null
@@ -1,2787 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-#include "facets.h"
-
-#define FACETS_HISTOGRAM_COLUMNS 150        // the target number of points in a histogram
-#define FACETS_KEYS_WITH_VALUES_MAX 200     // the max number of keys that can be facets
-#define FACETS_KEYS_IN_ROW_MAX 500          // the max number of keys in a row
-
-#define FACETS_KEYS_HASHTABLE_ENTRIES 15
-#define FACETS_VALUES_HASHTABLE_ENTRIES 15
-
-static inline void facets_reset_key(FACET_KEY *k);
-
-// ----------------------------------------------------------------------------
-
-static const char id_encoding_characters[64 + 1] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ.abcdefghijklmnopqrstuvwxyz_0123456789";
-static const uint8_t id_encoding_characters_reverse[256] = {
-        ['A'] = 0,  ['B'] = 1,  ['C'] = 2,  ['D'] = 3,
-        ['E'] = 4,  ['F'] = 5,  ['G'] = 6,  ['H'] = 7,
-        ['I'] = 8,  ['J'] = 9,  ['K'] = 10, ['L'] = 11,
-        ['M'] = 12, ['N'] = 13, ['O'] = 14, ['P'] = 15,
-        ['Q'] = 16, ['R'] = 17, ['S'] = 18, ['T'] = 19,
-        ['U'] = 20, ['V'] = 21, ['W'] = 22, ['X'] = 23,
-        ['Y'] = 24, ['Z'] = 25, ['.'] = 26, ['a'] = 27,
-        ['b'] = 28, ['c'] = 29, ['d'] = 30, ['e'] = 31,
-        ['f'] = 32, ['g'] = 33, ['h'] = 34, ['i'] = 35,
-        ['j'] = 36, ['k'] = 37, ['l'] = 38, ['m'] = 39,
-        ['n'] = 40, ['o'] = 41, ['p'] = 42, ['q'] = 43,
-        ['r'] = 44, ['s'] = 45, ['t'] = 46, ['u'] = 47,
-        ['v'] = 48, ['w'] = 49, ['x'] = 50, ['y'] = 51,
-        ['z'] = 52, ['_'] = 53, ['0'] = 54, ['1'] = 55,
-        ['2'] = 56, ['3'] = 57, ['4'] = 58, ['5'] = 59,
-        ['6'] = 60, ['7'] = 61, ['8'] = 62, ['9'] = 63
-};
-
-#define FACET_STRING_HASH_SIZE 12
-#define FACETS_HASH XXH64_hash_t
-#define FACETS_HASH_FUNCTION(src, len) XXH3_64bits(src, len)
-#define FACETS_HASH_ZERO (FACETS_HASH)0
-#define FACETS_HASH_UNSAMPLED (FACETS_HASH)(UINT64_MAX - 1)
-#define FACETS_HASH_ESTIMATED (FACETS_HASH)UINT64_MAX
-
-static inline void facets_hash_to_str(FACETS_HASH num, char *out) {
-    out[11] = '\0';
-    out[10] = id_encoding_characters[num & 63]; num >>= 6;
-    out[9]  = id_encoding_characters[num & 63]; num >>= 6;
-    out[8]  = id_encoding_characters[num & 63]; num >>= 6;
-    out[7]  = id_encoding_characters[num & 63]; num >>= 6;
-    out[6]  = id_encoding_characters[num & 63]; num >>= 6;
-    out[5]  = id_encoding_characters[num & 63]; num >>= 6;
-    out[4]  = id_encoding_characters[num & 63]; num >>= 6;
-    out[3]  = id_encoding_characters[num & 63]; num >>= 6;
-    out[2]  = id_encoding_characters[num & 63]; num >>= 6;
-    out[1]  = id_encoding_characters[num & 63]; num >>= 6;
-    out[0]  = id_encoding_characters[num & 63];
-}
-
-static inline FACETS_HASH str_to_facets_hash(const char *str) {
-    FACETS_HASH num = 0;
-    int shifts = 6 * (FACET_STRING_HASH_SIZE - 2);
-
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[0])])) << shifts; shifts -= 6;
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[1])])) << shifts; shifts -= 6;
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[2])])) << shifts; shifts -= 6;
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[3])])) << shifts; shifts -= 6;
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[4])])) << shifts; shifts -= 6;
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[5])])) << shifts; shifts -= 6;
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[6])])) << shifts; shifts -= 6;
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[7])])) << shifts; shifts -= 6;
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[8])])) << shifts; shifts -= 6;
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[9])])) << shifts; shifts -= 6;
-    num |= ((FACETS_HASH)(id_encoding_characters_reverse[(uint8_t)(str[10])])) << shifts;
-
-    return num;
-}
-
-static const char *hash_to_static_string(FACETS_HASH hash) {
-    static __thread char hash_str[FACET_STRING_HASH_SIZE];
-    facets_hash_to_str(hash, hash_str);
-    return hash_str;
-}
-
-static inline bool is_valid_string_hash(const char *s) {
-    if(strlen(s) != FACET_STRING_HASH_SIZE - 1) {
-        netdata_log_error("The user supplied key '%s' does not have the right length for a facets hash.", s);
-        return false;
-    }
-
-    uint8_t *t = (uint8_t *)s;
-    while(*t) {
-        if(id_encoding_characters_reverse[*t] == 0 && *t != id_encoding_characters[0]) {
-            netdata_log_error("The user supplied key '%s' contains invalid characters for a facets hash.", s);
-            return false;
-        }
-
-        t++;
-    }
-
-    return true;
-}
-
-// ----------------------------------------------------------------------------
-// hashtable for FACET_VALUE
-
-// cleanup hashtable defines
-#undef SIMPLE_HASHTABLE_SORT_FUNCTION
-#undef SIMPLE_HASHTABLE_VALUE_TYPE
-#undef SIMPLE_HASHTABLE_NAME
-#undef NETDATA_SIMPLE_HASHTABLE_H
-
-struct facet_value;
-// #define SIMPLE_HASHTABLE_SORT_FUNCTION compare_facet_value
-#define SIMPLE_HASHTABLE_VALUE_TYPE struct facet_value
-#define SIMPLE_HASHTABLE_NAME _VALUE
-#include "../simple_hashtable.h"
-
-// ----------------------------------------------------------------------------
-// hashtable for FACET_KEY
-
-// cleanup hashtable defines
-#undef SIMPLE_HASHTABLE_SORT_FUNCTION
-#undef SIMPLE_HASHTABLE_VALUE_TYPE
-#undef SIMPLE_HASHTABLE_NAME
-#undef NETDATA_SIMPLE_HASHTABLE_H
-
-struct facet_key;
-// #define SIMPLE_HASHTABLE_SORT_FUNCTION compare_facet_key
-#define SIMPLE_HASHTABLE_VALUE_TYPE struct facet_key
-#define SIMPLE_HASHTABLE_NAME _KEY
-#include "../simple_hashtable.h"
-
-// ----------------------------------------------------------------------------
-
-typedef struct facet_value {
-    FACETS_HASH hash;
-    const char *name;
-    const char *color;
-    uint32_t name_len;
-
-    bool selected;
-    bool empty;
-    bool unsampled;
-    bool estimated;
-
-    uint32_t rows_matching_facet_value;
-    uint32_t final_facet_value_counter;
-    uint32_t order;
-
-    uint32_t *histogram;
-    uint32_t min, max, sum;
-
-    struct facet_value *prev, *next;
-} FACET_VALUE;
-
-typedef enum {
-    FACET_KEY_VALUE_NONE        = 0,
-    FACET_KEY_VALUE_UPDATED     = (1 << 0),
-    FACET_KEY_VALUE_EMPTY       = (1 << 1),
-    FACET_KEY_VALUE_UNSAMPLED   = (1 << 2),
-    FACET_KEY_VALUE_ESTIMATED   = (1 << 3),
-    FACET_KEY_VALUE_COPIED      = (1 << 4),
-} FACET_KEY_VALUE_FLAGS;
-
-#define facet_key_value_updated(k) ((k)->current_value.flags & FACET_KEY_VALUE_UPDATED)
-#define facet_key_value_empty(k) ((k)->current_value.flags & FACET_KEY_VALUE_EMPTY)
-#define facet_key_value_unsampled(k) ((k)->current_value.flags & FACET_KEY_VALUE_UNSAMPLED)
-#define facet_key_value_estimated(k) ((k)->current_value.flags & FACET_KEY_VALUE_ESTIMATED)
-#define facet_key_value_empty_or_unsampled_or_estimated(k) ((k)->current_value.flags & (FACET_KEY_VALUE_EMPTY|FACET_KEY_VALUE_UNSAMPLED|FACET_KEY_VALUE_ESTIMATED))
-#define facet_key_value_copied(k) ((k)->current_value.flags & FACET_KEY_VALUE_COPIED)
-
-struct facet_key {
-    FACETS *facets;
-
-    FACETS_HASH hash;
-    const char *name;
-
-    FACET_KEY_OPTIONS options;
-
-    bool default_selected_for_values; // the default "selected" for all values in the dictionary
-
-    // members about the current row
-    uint32_t key_found_in_row;
-    uint32_t key_values_selected_in_row;
-    uint32_t order;
-
-    struct {
-        bool enabled;
-        uint32_t used;
-        FACET_VALUE *ll;
-        SIMPLE_HASHTABLE_VALUE ht;
-    } values;
-
-    struct {
-        FACETS_HASH hash;
-        FACET_KEY_VALUE_FLAGS flags;
-        const char *raw;
-        uint32_t raw_len;
-        BUFFER *b;
-        FACET_VALUE *v;
-    } current_value;
-
-    struct {
-        FACET_VALUE *v;
-    } empty_value;
-
-    struct {
-        FACET_VALUE *v;
-    } unsampled_value;
-
-    struct {
-        FACET_VALUE *v;
-    } estimated_value;
-
-    struct {
-        facet_dynamic_row_t cb;
-        void *data;
-    } dynamic;
-
-    struct {
-        bool view_only;
-        facets_key_transformer_t cb;
-        void *data;
-    } transform;
-
-    struct facet_key *prev, *next;
-};
-
-struct facets {
-    SIMPLE_PATTERN *visible_keys;
-    SIMPLE_PATTERN *excluded_keys;
-    SIMPLE_PATTERN *included_keys;
-
-    FACETS_OPTIONS options;
-
-    struct {
-        usec_t start_ut;
-        usec_t stop_ut;
-        FACETS_ANCHOR_DIRECTION direction;
-    } anchor;
-
-    SIMPLE_PATTERN *query;          // the full text search pattern
-    size_t keys_filtered_by_query;  // the number of fields we do full text search (constant)
-
-    DICTIONARY *accepted_params;
-
-    struct {
-        size_t count;
-        FACET_KEY *ll;
-        SIMPLE_HASHTABLE_KEY ht;
-    } keys;
-
-    struct {
-        // this is like a stack, of the keys that are used as facets
-        size_t used;
-        FACET_KEY *array[FACETS_KEYS_WITH_VALUES_MAX];
-    } keys_with_values;
-
-    struct {
-        // this is like a stack, of the keys that need to clean up between each row
-        size_t used;
-        FACET_KEY *array[FACETS_KEYS_IN_ROW_MAX];
-    } keys_in_row;
-
-    FACET_ROW *base;    // double linked list of the selected facets rows
-
-    uint32_t items_to_return;
-    uint32_t max_items_to_return;
-    uint32_t order;
-
-    struct {
-        FACET_ROW_SEVERITY severity;
-        size_t keys_matched_by_query_positive;   // the number of fields matched the full text search (per row)
-        size_t keys_matched_by_query_negative;   // the number of fields matched the full text search (per row)
-    } current_row;
-
-    struct {
-        usec_t after_ut;
-        usec_t before_ut;
-    } timeframe;
-
-    struct {
-        FACET_KEY *key;
-        FACETS_HASH hash;
-        char *chart;
-        bool enabled;
-        uint32_t slots;
-        usec_t slot_width_ut;
-        usec_t after_ut;
-        usec_t before_ut;
-    } histogram;
-
-    struct {
-        facet_row_severity_t cb;
-        void *data;
-    } severity;
-
-    struct {
-        FACET_ROW *last_added;
-
-        size_t first;
-        size_t forwards;
-        size_t backwards;
-        size_t skips_before;
-        size_t skips_after;
-        size_t prepends;
-        size_t appends;
-        size_t shifts;
-
-        struct {
-            size_t evaluated;
-            size_t matched;
-            size_t unsampled;
-            size_t estimated;
-            size_t created;
-            size_t reused;
-        } rows;
-
-        struct {
-            size_t registered;
-            size_t unique;
-        } keys;
-
-        struct {
-            size_t registered;
-            size_t transformed;
-            size_t dynamic;
-            size_t empty;
-            size_t unsampled;
-            size_t estimated;
-            size_t indexed;
-            size_t inserts;
-            size_t conflicts;
-        } values;
-
-        struct {
-            size_t searches;
-        } fts;
-    } operations;
-
-    struct {
-        DICTIONARY *used_hashes_registry;
-    } report;
-};
-
-usec_t facets_row_oldest_ut(FACETS *facets) {
-    if(facets->base)
-        return facets->base->prev->usec;
-
-    return 0;
-}
-
-usec_t facets_row_newest_ut(FACETS *facets) {
-    if(facets->base)
-        return facets->base->usec;
-
-    return 0;
-}
-
-uint32_t facets_rows(FACETS *facets) {
-    return facets->items_to_return;
-}
-
-// ----------------------------------------------------------------------------
-
-static void facets_row_free(FACETS *facets __maybe_unused, FACET_ROW *row);
-static inline void facet_value_is_used(FACET_KEY *k, FACET_VALUE *v);
-static inline bool facets_key_is_facet(FACETS *facets, FACET_KEY *k);
-
-// ----------------------------------------------------------------------------
-// The FACET_VALUE index within each FACET_KEY
-
-#define foreach_value_in_key(k, v) \
-    for((v) = (k)->values.ll; (v) ;(v) = (v)->next)
-
-#define foreach_value_in_key_done(v) do { ; } while(0)
-
-static inline void FACETS_VALUES_INDEX_CREATE(FACET_KEY *k) {
-    k->values.ll = NULL;
-    k->values.used = 0;
-    simple_hashtable_init_VALUE(&k->values.ht, FACETS_VALUES_HASHTABLE_ENTRIES);
-}
-
-static inline void FACETS_VALUES_INDEX_DESTROY(FACET_KEY *k) {
-    FACET_VALUE *v = k->values.ll;
-    while(v) {
-        FACET_VALUE *next = v->next;
-        freez(v->histogram);
-        freez((void *)v->name);
-        freez(v);
-        v = next;
-    }
-    k->values.ll = NULL;
-    k->values.used = 0;
-    k->values.enabled = false;
-
-    simple_hashtable_destroy_VALUE(&k->values.ht);
-}
-
-static inline const char *facets_key_get_value(FACET_KEY *k) {
-    return facet_key_value_copied(k) ? buffer_tostring(k->current_value.b) : k->current_value.raw;
-}
-
-static inline uint32_t facets_key_get_value_length(FACET_KEY *k) {
-    return facet_key_value_copied(k) ? buffer_strlen(k->current_value.b) : k->current_value.raw_len;
-}
-
-static inline void facets_key_value_copy_to_buffer(FACET_KEY *k) {
-    if(!facet_key_value_copied(k)) {
-        buffer_contents_replace(k->current_value.b, k->current_value.raw, k->current_value.raw_len);
-        k->current_value.flags |= FACET_KEY_VALUE_COPIED;
-    }
-}
-
-static const char *facets_value_dup(const char *s, uint32_t len) {
-    char *d = mallocz(len + 1);
-
-    if(len)
-        memcpy(d, s, len);
-
-    d[len] = '\0';
-
-    return d;
-}
-
-static inline void FACET_VALUE_ADD_CONFLICT(FACET_KEY *k, FACET_VALUE *v, const FACET_VALUE * const nv) {
-    if(!v->name && !v->name_len && nv->name && nv->name_len) {
-        // an actual value, not a filter
-        v->name = facets_value_dup(nv->name, nv->name_len);
-        v->name_len = nv->name_len;
-    }
-
-    if(v->name && v->name_len)
-        facet_value_is_used(k, v);
-
-    internal_fatal(v->name && nv->name && v->name_len == nv->name_len && memcmp(v->name, nv->name, v->name_len) != 0,
-                   "value hash conflict: '%s' and '%s' have the same hash '%s'",
-                   v->name, nv->name, hash_to_static_string(v->hash));
-
-    k->facets->operations.values.conflicts++;
-}
-
-static inline FACET_VALUE *FACET_VALUE_GET_FROM_INDEX(FACET_KEY *k, FACETS_HASH hash) {
-    SIMPLE_HASHTABLE_SLOT_VALUE *slot = simple_hashtable_get_slot_VALUE(&k->values.ht, hash, true);
-    return SIMPLE_HASHTABLE_SLOT_DATA(slot);
-}
-
-static inline FACET_VALUE *FACET_VALUE_ADD_TO_INDEX(FACET_KEY *k, const FACET_VALUE * const tv) {
-    SIMPLE_HASHTABLE_SLOT_VALUE *slot = simple_hashtable_get_slot_VALUE(&k->values.ht, tv->hash, true);
-
-    if(SIMPLE_HASHTABLE_SLOT_DATA(slot)) {
-        // already exists
-
-        FACET_VALUE *v = SIMPLE_HASHTABLE_SLOT_DATA(slot);
-        FACET_VALUE_ADD_CONFLICT(k, v, tv);
-        return v;
-    }
-
-    // we have to add it
-
-    FACET_VALUE *v = mallocz(sizeof(*v));
-    simple_hashtable_set_slot_VALUE(&k->values.ht, slot, tv->hash, v);
-
-    memcpy(v, tv, sizeof(*v));
-
-    if(v->estimated || v->unsampled) {
-        if(k->values.ll && k->values.ll->estimated) {
-            FACET_VALUE *estimated = k->values.ll;
-            DOUBLE_LINKED_LIST_INSERT_ITEM_AFTER_UNSAFE(k->values.ll, estimated, v, prev, next);
-        }
-        else
-            DOUBLE_LINKED_LIST_PREPEND_ITEM_UNSAFE(k->values.ll, v, prev, next);
-    }
-    else
-        DOUBLE_LINKED_LIST_APPEND_ITEM_UNSAFE(k->values.ll, v, prev, next);
-
-    k->values.used++;
-
-    if(!v->selected)
-        v->selected = k->default_selected_for_values;
-
-    if(v->name && v->name_len) {
-        // an actual value, not a filter
-        v->name = facets_value_dup(v->name, v->name_len);
-        facet_value_is_used(k, v);
-    }
-    else {
-        v->name = NULL;
-        v->name_len = 0;
-    }
-
-    k->facets->operations.values.inserts++;
-
-    return v;
-}
-
-static inline void FACET_VALUE_ADD_UNSAMPLED_VALUE_TO_INDEX(FACET_KEY *k) {
-    static const FACET_VALUE tv = {
-            .hash = FACETS_HASH_UNSAMPLED,
-            .name = FACET_VALUE_UNSAMPLED,
-            .name_len = sizeof(FACET_VALUE_UNSAMPLED) - 1,
-            .unsampled = true,
-            .color = "offline",
-    };
-
-    k->current_value.hash = FACETS_HASH_UNSAMPLED;
-
-    if(k->unsampled_value.v) {
-        FACET_VALUE_ADD_CONFLICT(k, k->unsampled_value.v, &tv);
-        k->current_value.v = k->unsampled_value.v;
-    }
-    else {
-        FACET_VALUE *v = FACET_VALUE_ADD_TO_INDEX(k, &tv);
-        v->unsampled = true;
-        k->unsampled_value.v = v;
-        k->current_value.v = v;
-    }
-}
-
-static inline void FACET_VALUE_ADD_ESTIMATED_VALUE_TO_INDEX(FACET_KEY *k) {
-    static const FACET_VALUE tv = {
-            .hash = FACETS_HASH_ESTIMATED,
-            .name = FACET_VALUE_ESTIMATED,
-            .name_len = sizeof(FACET_VALUE_ESTIMATED) - 1,
-            .estimated = true,
-            .color = "generic",
-    };
-
-    k->current_value.hash = FACETS_HASH_ESTIMATED;
-
-    if(k->estimated_value.v) {
-        FACET_VALUE_ADD_CONFLICT(k, k->estimated_value.v, &tv);
-        k->current_value.v = k->estimated_value.v;
-    }
-    else {
-        FACET_VALUE *v = FACET_VALUE_ADD_TO_INDEX(k, &tv);
-        v->estimated = true;
-        k->estimated_value.v = v;
-        k->current_value.v = v;
-    }
-}
-
-static inline void FACET_VALUE_ADD_EMPTY_VALUE_TO_INDEX(FACET_KEY *k) {
-    static const FACET_VALUE tv = {
-            .hash = FACETS_HASH_ZERO,
-            .name = FACET_VALUE_UNSET,
-            .name_len = sizeof(FACET_VALUE_UNSET) - 1,
-            .empty = true,
-    };
-
-    k->current_value.hash = FACETS_HASH_ZERO;
-
-    if(k->empty_value.v) {
-        FACET_VALUE_ADD_CONFLICT(k, k->empty_value.v, &tv);
-        k->current_value.v = k->empty_value.v;
-    }
-    else {
-        FACET_VALUE *v = FACET_VALUE_ADD_TO_INDEX(k, &tv);
-        v->empty = true;
-        k->empty_value.v = v;
-        k->current_value.v = v;
-    }
-}
-
-static inline void FACET_VALUE_ADD_CURRENT_VALUE_TO_INDEX(FACET_KEY *k) {
-    static __thread FACET_VALUE tv = { 0 };
-
-    internal_fatal(!facet_key_value_updated(k), "trying to add a non-updated value to the index");
-
-    tv.name = facets_key_get_value(k);
-    tv.name_len = facets_key_get_value_length(k);
-    tv.hash = FACETS_HASH_FUNCTION(tv.name, tv.name_len);
-    tv.empty = false;
-    tv.estimated = false;
-    tv.unsampled = false;
-
-    k->current_value.v = FACET_VALUE_ADD_TO_INDEX(k, &tv);
-    k->facets->operations.values.indexed++;
-}
-
-static inline void FACET_VALUE_ADD_OR_UPDATE_SELECTED(FACET_KEY *k, FACETS_HASH hash) {
-    FACET_VALUE tv = {
-            .hash = hash,
-            .selected = true,
-            .name = NULL,
-            .name_len = 0,
-    };
-    FACET_VALUE_ADD_TO_INDEX(k, &tv);
-}
-
-// ----------------------------------------------------------------------------
-// The FACET_KEY index within each FACET
-
-#define foreach_key_in_facets(facets, k) \
-    for((k) = (facets)->keys.ll; (k) ;(k) = (k)->next)
-
-#define foreach_key_in_facets_done(k) do { ; } while(0)
-
-static inline void facet_key_late_init(FACETS *facets, FACET_KEY *k) {
-    if(k->values.enabled)
-        return;
-
-    if(facets_key_is_facet(facets, k)) {
-        FACETS_VALUES_INDEX_CREATE(k);
-        k->values.enabled = true;
-        if(facets->keys_with_values.used < FACETS_KEYS_WITH_VALUES_MAX)
-            facets->keys_with_values.array[facets->keys_with_values.used++] = k;
-    }
-}
-
-static inline void FACETS_KEYS_INDEX_CREATE(FACETS *facets) {
-    facets->keys.ll = NULL;
-    facets->keys.count = 0;
-    facets->keys_with_values.used = 0;
-
-    simple_hashtable_init_KEY(&facets->keys.ht, FACETS_KEYS_HASHTABLE_ENTRIES);
-}
-
-static inline void FACETS_KEYS_INDEX_DESTROY(FACETS *facets) {
-    FACET_KEY *k = facets->keys.ll;
-    while(k) {
-        FACET_KEY *next = k->next;
-
-        FACETS_VALUES_INDEX_DESTROY(k);
-        buffer_free(k->current_value.b);
-        freez((void *)k->name);
-        freez(k);
-
-        k = next;
-    }
-    facets->keys.ll = NULL;
-    facets->keys.count = 0;
-    facets->keys_with_values.used = 0;
-
-    simple_hashtable_destroy_KEY(&facets->keys.ht);
-}
-
-static inline FACET_KEY *FACETS_KEY_GET_FROM_INDEX(FACETS *facets, FACETS_HASH hash) {
-    SIMPLE_HASHTABLE_SLOT_KEY *slot = simple_hashtable_get_slot_KEY(&facets->keys.ht, hash, true);
-    return SIMPLE_HASHTABLE_SLOT_DATA(slot);
-}
-
-bool facets_key_name_value_length_is_selected(FACETS *facets, const char *key, size_t key_length, const char *value, size_t value_length) {
-    FACETS_HASH hash = FACETS_HASH_FUNCTION(key, key_length);
-    FACET_KEY *k = FACETS_KEY_GET_FROM_INDEX(facets, hash);
-    if(!k || k->default_selected_for_values)
-        return false;
-
-    hash = FACETS_HASH_FUNCTION(value, value_length);
-    FACET_VALUE *v = FACET_VALUE_GET_FROM_INDEX(k, hash);
-    return (v && v->selected) ? true : false;
-}
-
-void facets_add_possible_value_name_to_key(FACETS *facets, const char *key, size_t key_length, const char *value, size_t value_length) {
-    FACETS_HASH hash = FACETS_HASH_FUNCTION(key, key_length);
-    FACET_KEY *k = FACETS_KEY_GET_FROM_INDEX(facets, hash);
-    if(!k) return;
-
-    hash = FACETS_HASH_FUNCTION(value, value_length);
-    FACET_VALUE *v = FACET_VALUE_GET_FROM_INDEX(k, hash);
-    if(v && v->name && v->name_len) return;
-
-    FACET_VALUE tv = {
-            .hash = hash,
-            .name = value,
-            .name_len = value_length,
-    };
-    FACET_VALUE_ADD_TO_INDEX(k, &tv);
-}
-
-static void facet_key_set_name(FACET_KEY *k, const char *name, size_t name_length) {
-    internal_fatal(k->name && name && (strncmp(k->name, name, name_length) != 0 || k->name[name_length] != '\0'),
-            "key hash conflict: '%s' and '%s' have the same hash",
-            k->name, name);
-
-    if(likely(k->name || !name || !name_length))
-        return;
-
-    // an actual value, not a filter
-
-    char buf[name_length + 1];
-    memcpy(buf, name, name_length);
-    buf[name_length] = '\0';
-
-    internal_fatal(strchr(buf, '='), "found = in key");
-
-    k->name = strdupz(buf);
-    facet_key_late_init(k->facets, k);
-}
-
-static inline FACET_KEY *FACETS_KEY_CREATE(FACETS *facets, FACETS_HASH hash, const char *name, size_t name_length, FACET_KEY_OPTIONS options) {
-    facets->operations.keys.unique++;
-
-    FACET_KEY *k = callocz(1, sizeof(*k));
-
-    k->hash = hash;
-    k->facets = facets;
-    k->options = options;
-    k->current_value.b = buffer_create(sizeof(FACET_VALUE_UNSET), NULL);
-    k->default_selected_for_values = true;
-
-    if(!(k->options & FACET_KEY_OPTION_REORDER))
-        k->order = facets->order++;
-
-    if((k->options & FACET_KEY_OPTION_FTS) || (facets->options & FACETS_OPTION_ALL_KEYS_FTS))
-        facets->keys_filtered_by_query++;
-
-    facet_key_set_name(k, name, name_length);
-
-    DOUBLE_LINKED_LIST_APPEND_ITEM_UNSAFE(facets->keys.ll, k, prev, next);
-    facets->keys.count++;
-
-    return k;
-}
-
-static inline FACET_KEY *FACETS_KEY_ADD_TO_INDEX(FACETS *facets, FACETS_HASH hash, const char *name, size_t name_length, FACET_KEY_OPTIONS options) {
-    facets->operations.keys.registered++;
-
-    SIMPLE_HASHTABLE_SLOT_KEY *slot = simple_hashtable_get_slot_KEY(&facets->keys.ht, hash, true);
-
-    if(unlikely(!SIMPLE_HASHTABLE_SLOT_DATA(slot))) {
-        // we have to add it
-        FACET_KEY *k = FACETS_KEY_CREATE(facets, hash, name, name_length, options);
-
-        simple_hashtable_set_slot_KEY(&facets->keys.ht, slot, hash, k);
-
-        return k;
-    }
-
-    // already in the index
-
-    FACET_KEY *k = SIMPLE_HASHTABLE_SLOT_DATA(slot);
-
-    facet_key_set_name(k, name, name_length);
-
-    if(unlikely(k->options & FACET_KEY_OPTION_REORDER)) {
-        k->order = facets->order++;
-        k->options &= ~FACET_KEY_OPTION_REORDER;
-    }
-
-    return k;
-}
-
-bool facets_key_name_is_filter(FACETS *facets, const char *key) {
-    FACETS_HASH hash = FACETS_HASH_FUNCTION(key, strlen(key));
-    FACET_KEY *k = FACETS_KEY_GET_FROM_INDEX(facets, hash);
-    return (!k || k->default_selected_for_values) ? false : true;
-}
-
-bool facets_key_name_is_facet(FACETS *facets, const char *key) {
-    size_t key_len = strlen(key);
-    FACETS_HASH hash = FACETS_HASH_FUNCTION(key, key_len);
-    FACET_KEY *k = FACETS_KEY_ADD_TO_INDEX(facets, hash, key, key_len, 0);
-    return (k && (k->options & FACET_KEY_OPTION_FACET));
-}
-
-// ----------------------------------------------------------------------------
-
-size_t facets_histogram_slots(FACETS *facets) {
-    return facets->histogram.slots;
-}
-
-static usec_t calculate_histogram_bar_width(usec_t after_ut, usec_t before_ut) {
-    // Array of valid durations in seconds
-    static time_t valid_durations_s[] = {
-            1, 2, 5, 10, 15, 30,                                                // seconds
-            1 * 60, 2 * 60, 3 * 60, 5 * 60, 10 * 60, 15 * 60, 30 * 60,          // minutes
-            1 * 3600, 2 * 3600, 6 * 3600, 8 * 3600, 12 * 3600,                  // hours
-            1 * 86400, 2 * 86400, 3 * 86400, 5 * 86400, 7 * 86400, 14 * 86400,  // days
-            1 * (30*86400)                                                      // months
-    };
-    static int array_size = sizeof(valid_durations_s) / sizeof(valid_durations_s[0]);
-
-    usec_t duration_ut = before_ut - after_ut;
-    usec_t bar_width_ut = 1 * USEC_PER_SEC;
-
-    for (int i = array_size - 1; i >= 0; --i) {
-        if (duration_ut / (valid_durations_s[i] * USEC_PER_SEC) >= FACETS_HISTOGRAM_COLUMNS) {
-            bar_width_ut = valid_durations_s[i] * USEC_PER_SEC;
-            break;
-        }
-    }
-
-    return bar_width_ut;
-}
-
-static inline usec_t facets_histogram_slot_baseline_ut(FACETS *facets, usec_t ut) {
-    usec_t delta_ut = ut % facets->histogram.slot_width_ut;
-    return ut - delta_ut;
-}
-
-void facets_set_timeframe_and_histogram_by_id(FACETS *facets, const char *key_id, usec_t after_ut, usec_t before_ut) {
-    if(after_ut > before_ut) {
-        usec_t t = after_ut;
-        after_ut = before_ut;
-        before_ut = t;
-    }
-
-    facets->histogram.enabled = true;
-
-    if(key_id && *key_id && strlen(key_id) == FACET_STRING_HASH_SIZE - 1) {
-        facets->histogram.chart = strdupz(key_id);
-        facets->histogram.hash = str_to_facets_hash(facets->histogram.chart);
-    }
-    else {
-        freez(facets->histogram.chart);
-        facets->histogram.chart = NULL;
-        facets->histogram.hash = FACETS_HASH_ZERO;
-    }
-
-    facets->timeframe.after_ut = after_ut;
-    facets->timeframe.before_ut = before_ut;
-
-    facets->histogram.slot_width_ut = calculate_histogram_bar_width(after_ut, before_ut);
-    facets->histogram.after_ut = facets_histogram_slot_baseline_ut(facets, after_ut);
-    facets->histogram.before_ut = facets_histogram_slot_baseline_ut(facets, before_ut) + facets->histogram.slot_width_ut;
-    facets->histogram.slots = (facets->histogram.before_ut - facets->histogram.after_ut) / facets->histogram.slot_width_ut + 1;
-
-    internal_fatal(after_ut < facets->histogram.after_ut, "histogram after_ut is not less or equal to wanted after_ut");
-    internal_fatal(before_ut > facets->histogram.before_ut, "histogram before_ut is not more or equal to wanted before_ut");
-
-    if(facets->histogram.slots > 1000) {
-        facets->histogram.slots = 1000 + 1;
-        facets->histogram.slot_width_ut = (facets->histogram.before_ut - facets->histogram.after_ut) / 1000;
-    }
-}
-
-void facets_set_timeframe_and_histogram_by_name(FACETS *facets, const char *key_name, usec_t after_ut, usec_t before_ut) {
-    char hash_str[FACET_STRING_HASH_SIZE];
-    FACETS_HASH hash = FACETS_HASH_FUNCTION(key_name, strlen(key_name));
-    facets_hash_to_str(hash, hash_str);
-    facets_set_timeframe_and_histogram_by_id(facets, hash_str, after_ut, before_ut);
-}
-
-static inline uint32_t facets_histogram_slot_at_time_ut(FACETS *facets, usec_t usec, FACET_VALUE *v) {
-    if(unlikely(!v->histogram))
-        v->histogram = callocz(facets->histogram.slots, sizeof(*v->histogram));
-
-    usec_t base_ut = facets_histogram_slot_baseline_ut(facets, usec);
-
-    if(unlikely(base_ut < facets->histogram.after_ut))
-        base_ut = facets->histogram.after_ut;
-
-    if(unlikely(base_ut > facets->histogram.before_ut))
-        base_ut = facets->histogram.before_ut;
-
-    uint32_t slot = (base_ut - facets->histogram.after_ut) / facets->histogram.slot_width_ut;
-
-    if(unlikely(slot >= facets->histogram.slots))
-        slot = facets->histogram.slots - 1;
-
-    return slot;
-}
-
-static inline void facets_histogram_update_value_slot(FACETS *facets, usec_t usec, FACET_VALUE *v) {
-    uint32_t slot = facets_histogram_slot_at_time_ut(facets, usec, v);
-    v->histogram[slot]++;
-}
-
-static inline void facets_histogram_update_value(FACETS *facets, usec_t usec) {
-    if(!facets->histogram.enabled ||
-            !facets->histogram.key ||
-            !facets->histogram.key->values.enabled ||
-            !facet_key_value_updated(facets->histogram.key) ||
-            usec < facets->histogram.after_ut ||
-            usec > facets->histogram.before_ut)
-        return;
-
-    FACET_VALUE *v = facets->histogram.key->current_value.v;
-    facets_histogram_update_value_slot(facets, usec, v);
-}
-
-static usec_t overlap_duration_ut(usec_t start1, usec_t end1, usec_t start2, usec_t end2) {
-    usec_t overlap_start = MAX(start1, start2);
-    usec_t overlap_end = MIN(end1, end2);
-
-    if (overlap_start < overlap_end)
-        return overlap_end - overlap_start;
-    else
-        return 0; // No overlap
-}
-
-void facets_update_estimations(FACETS *facets, usec_t from_ut, usec_t to_ut, size_t entries) {
-    if(unlikely(!facets->histogram.enabled))
-        return;
-
-    if(unlikely(!overlap_duration_ut(facets->histogram.after_ut, facets->histogram.before_ut, from_ut, to_ut)))
-        return;
-
-    facets->operations.rows.evaluated += entries;
-    facets->operations.rows.matched += entries;
-    facets->operations.rows.estimated += entries;
-
-    if (!facets->histogram.enabled ||
-        !facets->histogram.key ||
-        !facets->histogram.key->values.enabled)
-        return;
-
-    if (from_ut < facets->histogram.after_ut)
-        from_ut = facets->histogram.after_ut;
-
-    if (to_ut > facets->histogram.before_ut)
-        to_ut = facets->histogram.before_ut;
-
-    if (!facets->histogram.key->estimated_value.v)
-        FACET_VALUE_ADD_ESTIMATED_VALUE_TO_INDEX(facets->histogram.key);
-
-    FACET_VALUE *v = facets->histogram.key->estimated_value.v;
-
-    size_t slots = 0;
-    size_t total_ut = to_ut - from_ut;
-    ssize_t remaining_entries = (ssize_t)entries;
-    size_t slot = facets_histogram_slot_at_time_ut(facets, from_ut, v);
-    for(; slot < facets->histogram.slots ;slot++) {
-        usec_t slot_start_ut = facets->histogram.after_ut + slot * facets->histogram.slot_width_ut;
-        usec_t slot_end_ut = slot_start_ut + facets->histogram.slot_width_ut;
-
-        if(slot_start_ut > to_ut)
-            break;
-
-        usec_t overlap_ut = overlap_duration_ut(from_ut, to_ut, slot_start_ut, slot_end_ut);
-
-        size_t slot_entries = (overlap_ut * entries) / total_ut;
-        v->histogram[slot] += slot_entries;
-        remaining_entries -= (ssize_t)slot_entries;
-        slots++;
-    }
-
-    // Check if all entries are assigned
-    // This should always be true if the distribution is correct
-    internal_fatal(remaining_entries < 0 || remaining_entries >= (ssize_t)(slots),
-                   "distribution of estimations is not accurate - there are %zd remaining entries",
-                   remaining_entries);
-}
-
-void facets_row_finished_unsampled(FACETS *facets, usec_t usec) {
-    facets->operations.rows.evaluated++;
-    facets->operations.rows.matched++;
-    facets->operations.rows.unsampled++;
-
-    if(!facets->histogram.enabled ||
-       !facets->histogram.key ||
-       !facets->histogram.key->values.enabled ||
-       usec < facets->histogram.after_ut ||
-       usec > facets->histogram.before_ut)
-        return;
-
-    if(!facets->histogram.key->unsampled_value.v)
-        FACET_VALUE_ADD_UNSAMPLED_VALUE_TO_INDEX(facets->histogram.key);
-
-    FACET_VALUE *v = facets->histogram.key->unsampled_value.v;
-    facets_histogram_update_value_slot(facets, usec, v);
-
-    facets_reset_key(facets->histogram.key);
-}
-
-static const char *facets_key_name_cached(FACET_KEY *k, DICTIONARY *used_hashes_registry) {
-    if(k->name) {
-        if(used_hashes_registry && !k->default_selected_for_values) {
-            char hash_str[FACET_STRING_HASH_SIZE];
-            facets_hash_to_str(k->hash, hash_str);
-            dictionary_set(used_hashes_registry, hash_str, (void *)k->name, strlen(k->name) + 1);
-        }
-
-        return k->name;
-    }
-
-    // key has no name
-    const char *name = "[UNAVAILABLE_FIELD]";
-
-    if(used_hashes_registry) {
-        char hash_str[FACET_STRING_HASH_SIZE];
-        facets_hash_to_str(k->hash, hash_str);
-        const char *s = dictionary_get(used_hashes_registry, hash_str);
-        if(s) name = s;
-    }
-
-    return name;
-}
-
-static const char *facets_key_value_cached(FACET_KEY *k, FACET_VALUE *v, DICTIONARY *used_hashes_registry) {
-    if(v->empty || v->estimated || v->unsampled)
-        return v->name;
-
-    if(v->name && v->name_len) {
-        if(used_hashes_registry && !k->default_selected_for_values && v->selected) {
-            char hash_str[FACET_STRING_HASH_SIZE];
-            facets_hash_to_str(v->hash, hash_str);
-            dictionary_set(used_hashes_registry, hash_str, (void *)v->name, v->name_len + 1);
-        }
-
-        return v->name;
-    }
-
-    // key has no name
-    const char *name = "[unavailable field]";
-
-    if(used_hashes_registry) {
-        char hash_str[FACET_STRING_HASH_SIZE];
-        facets_hash_to_str(v->hash, hash_str);
-        const char *s = dictionary_get(used_hashes_registry, hash_str);
-        if(s) name = s;
-    }
-
-    return name;
-}
-
-static inline void facets_key_value_transformed(FACETS *facets, FACET_KEY *k, FACET_VALUE *v, BUFFER *dst, FACETS_TRANSFORMATION_SCOPE scope) {
-    buffer_flush(dst);
-
-    if(v->empty || v->unsampled || v->estimated)
-        buffer_strcat(dst, v->name);
-    else if(k->transform.cb && k->transform.view_only) {
-        buffer_contents_replace(dst, v->name, v->name_len);
-        k->transform.cb(facets, dst, scope, k->transform.data);
-    }
-    else
-        buffer_strcat(dst, facets_key_value_cached(k, v, facets->report.used_hashes_registry));
-}
-
-static inline void facets_histogram_value_names(BUFFER *wb, FACETS *facets __maybe_unused, FACET_KEY *k, const char *key, const char *first_key) {
-    CLEAN_BUFFER *tb = buffer_create(0, NULL);
-
-    buffer_json_member_add_array(wb, key);
-    {
-        if(first_key)
-            buffer_json_add_array_item_string(wb, first_key);
-
-        if(k && k->values.enabled) {
-            FACET_VALUE *v;
-            foreach_value_in_key(k, v) {
-                if (unlikely(!v->histogram))
-                    continue;
-
-                facets_key_value_transformed(facets, k, v, tb, FACETS_TRANSFORM_HISTOGRAM);
-                buffer_json_add_array_item_string(wb, buffer_tostring(tb));
-            }
-            foreach_value_in_key_done(v);
-        }
-    }
-    buffer_json_array_close(wb); // key
-}
-
-static inline void facets_histogram_value_colors(BUFFER *wb, FACETS *facets __maybe_unused, FACET_KEY *k, const char *key) {
-    buffer_json_member_add_array(wb, key);
-    {
-        if(k && k->values.enabled) {
-            FACET_VALUE *v;
-            foreach_value_in_key(k, v) {
-                if (unlikely(!v->histogram))
-                    continue;
-
-                buffer_json_add_array_item_string(wb, v->color);
-            }
-            foreach_value_in_key_done(v);
-        }
-    }
-    buffer_json_array_close(wb); // key
-}
-
-static inline void facets_histogram_value_units(BUFFER *wb, FACETS *facets __maybe_unused, FACET_KEY *k, const char *key) {
-    buffer_json_member_add_array(wb, key);
-    {
-        if(k && k->values.enabled) {
-            FACET_VALUE *v;
-            foreach_value_in_key(k, v) {
-                if (unlikely(!v->histogram))
-                    continue;
-
-                buffer_json_add_array_item_string(wb, "events");
-            }
-            foreach_value_in_key_done(v);
-        }
-    }
-    buffer_json_array_close(wb); // key
-}
-
-static inline void facets_histogram_value_min(BUFFER *wb, FACETS *facets __maybe_unused, FACET_KEY *k, const char *key) {
-    buffer_json_member_add_array(wb, key);
-    {
-        if(k && k->values.enabled) {
-            FACET_VALUE *v;
-            foreach_value_in_key(k, v) {
-                if (unlikely(!v->histogram))
-                    continue;
-
-                buffer_json_add_array_item_uint64(wb, v->min);
-            }
-            foreach_value_in_key_done(v);
-        }
-    }
-    buffer_json_array_close(wb); // key
-}
-
-static inline void facets_histogram_value_max(BUFFER *wb, FACETS *facets __maybe_unused, FACET_KEY *k, const char *key) {
-    buffer_json_member_add_array(wb, key);
-    {
-        if(k && k->values.enabled) {
-            FACET_VALUE *v;
-            foreach_value_in_key(k, v) {
-                if (unlikely(!v->histogram))
-                    continue;
-
-                buffer_json_add_array_item_uint64(wb, v->max);
-            }
-            foreach_value_in_key_done(v);
-        }
-    }
-    buffer_json_array_close(wb); // key
-}
-
-static inline void facets_histogram_value_avg(BUFFER *wb, FACETS *facets __maybe_unused, FACET_KEY *k, const char *key) {
-    buffer_json_member_add_array(wb, key);
-    {
-        if(k && k->values.enabled) {
-            FACET_VALUE *v;
-            foreach_value_in_key(k, v) {
-                if (unlikely(!v->histogram))
-                    continue;
-
-                buffer_json_add_array_item_double(wb, (double) v->sum / (double) facets->histogram.slots);
-            }
-            foreach_value_in_key_done(v);
-        }
-    }
-    buffer_json_array_close(wb); // key
-}
-
-static inline void facets_histogram_value_arp(BUFFER *wb, FACETS *facets __maybe_unused, FACET_KEY *k, const char *key) {
-    buffer_json_member_add_array(wb, key);
-    {
-        if(k && k->values.enabled) {
-            FACET_VALUE *v;
-            foreach_value_in_key(k, v) {
-                if (unlikely(!v->histogram))
-                    continue;
-
-                buffer_json_add_array_item_uint64(wb, 0);
-            }
-            foreach_value_in_key_done(v);
-        }
-    }
-    buffer_json_array_close(wb); // key
-}
-
-static inline void facets_histogram_value_con(BUFFER *wb, FACETS *facets __maybe_unused, FACET_KEY *k, const char *key, uint32_t sum) {
-    buffer_json_member_add_array(wb, key);
-    {
-        if(k && k->values.enabled) {
-            FACET_VALUE *v;
-            foreach_value_in_key(k, v) {
-                if (unlikely(!v->histogram))
-                    continue;
-
-                buffer_json_add_array_item_double(wb, (double) v->sum * 100.0 / (double) sum);
-            }
-            foreach_value_in_key_done(v);
-        }
-    }
-    buffer_json_array_close(wb); // key
-}
-
-static void facets_histogram_generate(FACETS *facets, FACET_KEY *k, BUFFER *wb) {
-    CLEAN_BUFFER *tmp = buffer_create(0, NULL);
-
-    size_t dimensions = 0;
-    uint32_t min = UINT32_MAX, max = 0, sum = 0, count = 0;
-
-    if(k && k->values.enabled) {
-        FACET_VALUE *v;
-        foreach_value_in_key(k, v) {
-            if (unlikely(!v->histogram))
-                continue;
-
-            dimensions++;
-
-            v->min = UINT32_MAX;
-            v->max = 0;
-            v->sum = 0;
-
-            for(uint32_t i = 0; i < facets->histogram.slots ;i++) {
-                uint32_t n = v->histogram[i];
-
-                if(n < min)
-                    min = n;
-
-                if(n > max)
-                    max = n;
-
-                sum += n;
-                count++;
-
-                if(n < v->min)
-                    v->min = n;
-
-                if(n > v->max)
-                    v->max = n;
-
-                v->sum += n;
-            }
-        }
-        foreach_value_in_key_done(v);
-    }
-
-    buffer_json_member_add_object(wb, "summary");
-    {
-        // summary.nodes
-        buffer_json_member_add_array(wb, "nodes");
-        {
-            buffer_json_add_array_item_object(wb); // node
-            {
-                buffer_json_member_add_string(wb, "mg", "default");
-                buffer_json_member_add_string(wb, "nm", "facets.histogram");
-                buffer_json_member_add_uint64(wb, "ni", 0);
-                buffer_json_member_add_object(wb, "st");
-                {
-                    buffer_json_member_add_uint64(wb, "ai", 0);
-                    buffer_json_member_add_uint64(wb, "code", 200);
-                    buffer_json_member_add_string(wb, "msg", "");
-                }
-                buffer_json_object_close(wb); // st
-
-                if(dimensions) {
-                    buffer_json_member_add_object(wb, "is");
-                    {
-                        buffer_json_member_add_uint64(wb, "sl", 1);
-                        buffer_json_member_add_uint64(wb, "qr", 1);
-                    }
-                    buffer_json_object_close(wb); // is
-
-                    buffer_json_member_add_object(wb, "ds");
-                    {
-                        buffer_json_member_add_uint64(wb, "sl", dimensions);
-                        buffer_json_member_add_uint64(wb, "qr", dimensions);
-                    }
-                    buffer_json_object_close(wb); // ds
-                }
-
-                if(count) {
-                    buffer_json_member_add_object(wb, "sts");
-                    {
-                        buffer_json_member_add_uint64(wb, "min", min);
-                        buffer_json_member_add_uint64(wb, "max", max);
-                        buffer_json_member_add_double(wb, "avg", (double) sum / (double) count);
-                        buffer_json_member_add_double(wb, "con", 100.0);
-                    }
-                    buffer_json_object_close(wb); // sts
-                }
-            }
-            buffer_json_object_close(wb); // node
-        }
-        buffer_json_array_close(wb); // nodes
-
-        // summary.contexts
-        buffer_json_member_add_array(wb, "contexts");
-        {
-            buffer_json_add_array_item_object(wb); // context
-            {
-                buffer_json_member_add_string(wb, "id", "facets.histogram");
-
-                if(dimensions) {
-                    buffer_json_member_add_object(wb, "is");
-                    {
-                        buffer_json_member_add_uint64(wb, "sl", 1);
-                        buffer_json_member_add_uint64(wb, "qr", 1);
-                    }
-                    buffer_json_object_close(wb); // is
-
-                    buffer_json_member_add_object(wb, "ds");
-                    {
-                        buffer_json_member_add_uint64(wb, "sl", dimensions);
-                        buffer_json_member_add_uint64(wb, "qr", dimensions);
-                    }
-                    buffer_json_object_close(wb); // ds
-                }
-
-                if(count) {
-                    buffer_json_member_add_object(wb, "sts");
-                    {
-                        buffer_json_member_add_uint64(wb, "min", min);
-                        buffer_json_member_add_uint64(wb, "max", max);
-                        buffer_json_member_add_double(wb, "avg", (double) sum / (double) count);
-                        buffer_json_member_add_double(wb, "con", 100.0);
-                    }
-                    buffer_json_object_close(wb); // sts
-                }
-            }
-            buffer_json_object_close(wb); // context
-        }
-        buffer_json_array_close(wb); // contexts
-
-        // summary.instances
-        buffer_json_member_add_array(wb, "instances");
-        {
-            buffer_json_add_array_item_object(wb); // instance
-            {
-                buffer_json_member_add_string(wb, "id", "facets.histogram");
-                buffer_json_member_add_uint64(wb, "ni", 0);
-
-                if(dimensions) {
-                    buffer_json_member_add_object(wb, "ds");
-                    {
-                        buffer_json_member_add_uint64(wb, "sl", dimensions);
-                        buffer_json_member_add_uint64(wb, "qr", dimensions);
-                    }
-                    buffer_json_object_close(wb); // ds
-                }
-
-                if(count) {
-                    buffer_json_member_add_object(wb, "sts");
-                    {
-                        buffer_json_member_add_uint64(wb, "min", min);
-                        buffer_json_member_add_uint64(wb, "max", max);
-                        buffer_json_member_add_double(wb, "avg", (double) sum / (double) count);
-                        buffer_json_member_add_double(wb, "con", 100.0);
-                    }
-                    buffer_json_object_close(wb); // sts
-                }
-            }
-            buffer_json_object_close(wb); // instance
-        }
-        buffer_json_array_close(wb); // instances
-
-        // summary.dimensions
-        buffer_json_member_add_array(wb, "dimensions");
-        if(dimensions && k && k->values.enabled) {
-            size_t pri = 0;
-            FACET_VALUE *v;
-
-            foreach_value_in_key(k, v) {
-                if(unlikely(!v->histogram))
-                    continue;
-
-                buffer_json_add_array_item_object(wb); // dimension
-                {
-                    facets_key_value_transformed(facets, k, v, tmp, FACETS_TRANSFORM_HISTOGRAM);
-                    buffer_json_member_add_string(wb, "id", buffer_tostring(tmp));
-                    buffer_json_member_add_object(wb, "ds");
-                    {
-                        buffer_json_member_add_uint64(wb, "sl", 1);
-                        buffer_json_member_add_uint64(wb, "qr", 1);
-                    }
-                    buffer_json_object_close(wb); // ds
-                    buffer_json_member_add_object(wb, "sts");
-                    {
-                        buffer_json_member_add_uint64(wb, "min", v->min);
-                        buffer_json_member_add_uint64(wb, "max", v->max);
-                        buffer_json_member_add_double(wb, "avg", (double)v->sum / (double)facets->histogram.slots);
-                        buffer_json_member_add_double(wb, "con", (double)v->sum * 100.0 / (double)sum);
-                    }
-                    buffer_json_object_close(wb); // sts
-                    buffer_json_member_add_uint64(wb, "pri", pri++);
-                }
-                buffer_json_object_close(wb); // dimension
-            }
-            foreach_value_in_key_done(v);
-        }
-        buffer_json_array_close(wb); // dimensions
-
-        buffer_json_member_add_array(wb, "labels");
-        buffer_json_array_close(wb); // labels
-
-        buffer_json_member_add_array(wb, "alerts");
-        buffer_json_array_close(wb); // alerts
-    }
-    buffer_json_object_close(wb); // summary
-
-    buffer_json_member_add_object(wb, "totals");
-    {
-        buffer_json_member_add_object(wb, "nodes");
-        {
-            buffer_json_member_add_uint64(wb, "sl", 1);
-            buffer_json_member_add_uint64(wb, "qr", 1);
-        }
-        buffer_json_object_close(wb); // nodes
-
-        if(dimensions) {
-            buffer_json_member_add_object(wb, "contexts");
-            {
-                buffer_json_member_add_uint64(wb, "sl", 1);
-                buffer_json_member_add_uint64(wb, "qr", 1);
-            }
-            buffer_json_object_close(wb); // contexts
-            buffer_json_member_add_object(wb, "instances");
-            {
-                buffer_json_member_add_uint64(wb, "sl", 1);
-                buffer_json_member_add_uint64(wb, "qr", 1);
-            }
-            buffer_json_object_close(wb); // instances
-
-            buffer_json_member_add_object(wb, "dimensions");
-            {
-                buffer_json_member_add_uint64(wb, "sl", dimensions);
-                buffer_json_member_add_uint64(wb, "qr", dimensions);
-            }
-            buffer_json_object_close(wb); // dimension
-        }
-    }
-    buffer_json_object_close(wb); // totals
-
-    buffer_json_member_add_object(wb, "result");
-    {
-        facets_histogram_value_names(wb, facets, k, "labels", "time");
-
-        buffer_json_member_add_object(wb, "point");
-        {
-            buffer_json_member_add_uint64(wb, "value", 0);
-            buffer_json_member_add_uint64(wb, "arp", 1);
-            buffer_json_member_add_uint64(wb, "pa", 2);
-        }
-        buffer_json_object_close(wb); // point
-
-        buffer_json_member_add_array(wb, "data");
-        if(k && k->values.enabled) {
-            usec_t t = facets->histogram.after_ut;
-            for(uint32_t i = 0; i < facets->histogram.slots ;i++) {
-                buffer_json_add_array_item_array(wb); // row
-                {
-                    buffer_json_add_array_item_time_ms(wb, t / USEC_PER_SEC);
-
-                    FACET_VALUE *v;
-                    foreach_value_in_key(k, v) {
-                        if (unlikely(!v->histogram))
-                            continue;
-
-                        buffer_json_add_array_item_array(wb); // point
-
-                        buffer_json_add_array_item_uint64(wb, v->histogram[i]);
-                        buffer_json_add_array_item_uint64(wb, 0); // arp - anomaly rate
-                        buffer_json_add_array_item_uint64(wb, 0); // pa - point annotation
-
-                        buffer_json_array_close(wb); // point
-                    }
-                    foreach_value_in_key_done(v);
-                }
-                buffer_json_array_close(wb); // row
-
-                t += facets->histogram.slot_width_ut;
-            }
-        }
-        buffer_json_array_close(wb); //data
-    }
-    buffer_json_object_close(wb); // result
-
-    buffer_json_member_add_object(wb, "db");
-    {
-        buffer_json_member_add_uint64(wb, "tiers", 1);
-        buffer_json_member_add_uint64(wb, "update_every", facets->histogram.slot_width_ut / USEC_PER_SEC);
-//        we should add these only when we know the retention of the db
-//        buffer_json_member_add_time_t(wb, "first_entry", facets->histogram.after_ut / USEC_PER_SEC);
-//        buffer_json_member_add_time_t(wb, "last_entry", facets->histogram.before_ut / USEC_PER_SEC);
-        buffer_json_member_add_string(wb, "units", "events");
-        buffer_json_member_add_object(wb, "dimensions");
-        {
-            facets_histogram_value_names(wb, facets, k, "ids", NULL);
-            facets_histogram_value_units(wb, facets, k, "units");
-
-            buffer_json_member_add_object(wb, "sts");
-            {
-                facets_histogram_value_min(wb, facets, k, "min");
-                facets_histogram_value_max(wb, facets, k, "max");
-                facets_histogram_value_avg(wb, facets, k, "avg");
-                facets_histogram_value_arp(wb, facets, k, "arp");
-                facets_histogram_value_con(wb, facets, k, "con", sum);
-            }
-            buffer_json_object_close(wb); // sts
-        }
-        buffer_json_object_close(wb); // dimensions
-
-        buffer_json_member_add_array(wb, "per_tier");
-        {
-            buffer_json_add_array_item_object(wb); // tier0
-            {
-                buffer_json_member_add_uint64(wb, "tier", 0);
-                buffer_json_member_add_uint64(wb, "queries", 1);
-                buffer_json_member_add_uint64(wb, "points", count);
-                buffer_json_member_add_time_t(wb, "update_every", facets->histogram.slot_width_ut / USEC_PER_SEC);
-//                we should add these only when we know the retention of the db
-//                buffer_json_member_add_time_t(wb, "first_entry", facets->histogram.after_ut / USEC_PER_SEC);
-//                buffer_json_member_add_time_t(wb, "last_entry", facets->histogram.before_ut / USEC_PER_SEC);
-            }
-            buffer_json_object_close(wb); // tier0
-        }
-        buffer_json_array_close(wb); // per_tier
-    }
-    buffer_json_object_close(wb); // db
-
-    buffer_json_member_add_object(wb, "view");
-    {
-        char title[1024 + 1] = "Events Distribution";
-        FACET_KEY *kt = FACETS_KEY_GET_FROM_INDEX(facets, facets->histogram.hash);
-        if(kt && kt->name)
-            snprintfz(title, sizeof(title) - 1, "Events Distribution by %s", kt->name);
-
-        buffer_json_member_add_string(wb, "title", title);
-        buffer_json_member_add_time_t(wb, "update_every", facets->histogram.slot_width_ut / USEC_PER_SEC);
-        buffer_json_member_add_time_t(wb, "after", facets->histogram.after_ut / USEC_PER_SEC);
-        buffer_json_member_add_time_t(wb, "before", facets->histogram.before_ut / USEC_PER_SEC);
-        buffer_json_member_add_string(wb, "units", "events");
-        buffer_json_member_add_string(wb, "chart_type", "stackedBar");
-        buffer_json_member_add_object(wb, "dimensions");
-        {
-            buffer_json_member_add_array(wb, "grouped_by");
-            {
-                buffer_json_add_array_item_string(wb, "dimension");
-            }
-            buffer_json_array_close(wb); // grouped_by
-
-            facets_histogram_value_names(wb, facets, k, "ids", NULL);
-            facets_histogram_value_names(wb, facets, k, "names", NULL);
-            facets_histogram_value_colors(wb, facets, k, "colors");
-            facets_histogram_value_units(wb, facets, k, "units");
-
-            buffer_json_member_add_object(wb, "sts");
-            {
-                facets_histogram_value_min(wb, facets, k, "min");
-                facets_histogram_value_max(wb, facets, k, "max");
-                facets_histogram_value_avg(wb, facets, k, "avg");
-                facets_histogram_value_arp(wb, facets, k, "arp");
-                facets_histogram_value_con(wb, facets, k, "con", sum);
-            }
-            buffer_json_object_close(wb); // sts
-        }
-        buffer_json_object_close(wb); // dimensions
-
-        buffer_json_member_add_uint64(wb, "min", min);
-        buffer_json_member_add_uint64(wb, "max", max);
-    }
-    buffer_json_object_close(wb); // view
-
-    buffer_json_member_add_array(wb, "agents");
-    {
-        buffer_json_add_array_item_object(wb); // agent
-        {
-            buffer_json_member_add_string(wb, "mg", "default");
-            buffer_json_member_add_string(wb, "nm", "facets.histogram");
-            buffer_json_member_add_time_t(wb, "now", now_realtime_sec());
-            buffer_json_member_add_uint64(wb, "ai", 0);
-        }
-        buffer_json_object_close(wb); // agent
-    }
-    buffer_json_array_close(wb); // agents
-}
-
-// ----------------------------------------------------------------------------
-
-static inline void facet_value_is_used(FACET_KEY *k, FACET_VALUE *v) {
-    if(!k->key_found_in_row)
-        v->rows_matching_facet_value++;
-
-    k->key_found_in_row++;
-
-    if(v->selected)
-        k->key_values_selected_in_row++;
-}
-
-static inline bool facets_key_is_facet(FACETS *facets, FACET_KEY *k) {
-    bool included = true, excluded = false, never = false;
-
-    if(k->options & (FACET_KEY_OPTION_FACET | FACET_KEY_OPTION_NO_FACET | FACET_KEY_OPTION_NEVER_FACET)) {
-        if(k->options & FACET_KEY_OPTION_FACET) {
-            included = true;
-            excluded = false;
-            never = false;
-        }
-        else if(k->options & (FACET_KEY_OPTION_NO_FACET | FACET_KEY_OPTION_NEVER_FACET)) {
-            included = false;
-            excluded = true;
-            never = true;
-        }
-    }
-    else {
-        if (facets->included_keys) {
-            if (!simple_pattern_matches(facets->included_keys, k->name))
-                included = false;
-        }
-
-        if (facets->excluded_keys) {
-            if (simple_pattern_matches(facets->excluded_keys, k->name)) {
-                excluded = true;
-                never = true;
-            }
-        }
-    }
-
-    if(included && !excluded) {
-        k->options |= FACET_KEY_OPTION_FACET;
-        k->options &= ~FACET_KEY_OPTION_NO_FACET;
-        return true;
-    }
-
-    k->options |= FACET_KEY_OPTION_NO_FACET;
-    k->options &= ~FACET_KEY_OPTION_FACET;
-
-    if(never)
-        k->options |= FACET_KEY_OPTION_NEVER_FACET;
-
-    return false;
-}
-
-// ----------------------------------------------------------------------------
-
-FACETS *facets_create(uint32_t items_to_return, FACETS_OPTIONS options, const char *visible_keys, const char *facet_keys, const char *non_facet_keys) {
-    FACETS *facets = callocz(1, sizeof(FACETS));
-    facets->options = options;
-    FACETS_KEYS_INDEX_CREATE(facets);
-
-    if(facet_keys && *facet_keys)
-        facets->included_keys = simple_pattern_create(facet_keys, "|", SIMPLE_PATTERN_EXACT, true);
-
-    if(non_facet_keys && *non_facet_keys)
-        facets->excluded_keys = simple_pattern_create(non_facet_keys, "|", SIMPLE_PATTERN_EXACT, true);
-
-    if(visible_keys && *visible_keys)
-        facets->visible_keys = simple_pattern_create(visible_keys, "|", SIMPLE_PATTERN_EXACT, true);
-
-    facets->max_items_to_return = items_to_return > 1 ? items_to_return : 2;
-    facets->anchor.start_ut = 0;
-    facets->anchor.stop_ut = 0;
-    facets->anchor.direction = FACETS_ANCHOR_DIRECTION_BACKWARD;
-    facets->order = 1;
-
-    return facets;
-}
-
-void facets_destroy(FACETS *facets) {
-    dictionary_destroy(facets->accepted_params);
-    FACETS_KEYS_INDEX_DESTROY(facets);
-    simple_pattern_free(facets->visible_keys);
-    simple_pattern_free(facets->included_keys);
-    simple_pattern_free(facets->excluded_keys);
-
-    while(facets->base) {
-        FACET_ROW *r = facets->base;
-        DOUBLE_LINKED_LIST_REMOVE_ITEM_UNSAFE(facets->base, r, prev, next);
-
-        facets_row_free(facets, r);
-    }
-
-    freez(facets->histogram.chart);
-    freez(facets);
-}
-
-void facets_accepted_param(FACETS *facets, const char *param) {
-    if(!facets->accepted_params)
-        facets->accepted_params = dictionary_create(DICT_OPTION_SINGLE_THREADED|DICT_OPTION_DONT_OVERWRITE_VALUE);
-
-    dictionary_set(facets->accepted_params, param, NULL, 0);
-}
-
-static inline FACET_KEY *facets_register_key_name_length(FACETS *facets, const char *key, size_t key_length, FACET_KEY_OPTIONS options) {
-    return FACETS_KEY_ADD_TO_INDEX(facets, FACETS_HASH_FUNCTION(key, key_length), key, key_length, options);
-}
-
-inline FACET_KEY *facets_register_key_name(FACETS *facets, const char *key, FACET_KEY_OPTIONS options) {
-    return facets_register_key_name_length(facets, key, strlen(key), options);
-}
-
-inline FACET_KEY *facets_register_key_name_transformation(FACETS *facets, const char *key, FACET_KEY_OPTIONS options, facets_key_transformer_t cb, void *data) {
-    FACET_KEY *k = facets_register_key_name(facets, key, options);
-    k->transform.cb = cb;
-    k->transform.data = data;
-    k->transform.view_only = (options & FACET_KEY_OPTION_TRANSFORM_VIEW) ? true : false;
-    return k;
-}
-
-inline FACET_KEY *facets_register_dynamic_key_name(FACETS *facets, const char *key, FACET_KEY_OPTIONS options, facet_dynamic_row_t cb, void *data) {
-    FACET_KEY *k = facets_register_key_name(facets, key, options);
-    k->dynamic.cb = cb;
-    k->dynamic.data = data;
-    return k;
-}
-
-void facets_set_query(FACETS *facets, const char *query) {
-    if(!query)
-        return;
-
-    facets->query = simple_pattern_create(query, "|", SIMPLE_PATTERN_SUBSTRING, false);
-}
-
-void facets_set_items(FACETS *facets, uint32_t items) {
-    facets->max_items_to_return = items > 1 ? items : 2;
-}
-
-void facets_set_anchor(FACETS *facets, usec_t start_ut, usec_t stop_ut, FACETS_ANCHOR_DIRECTION direction) {
-    facets->anchor.start_ut = start_ut;
-    facets->anchor.stop_ut = stop_ut;
-    facets->anchor.direction = direction;
-
-    if((facets->anchor.direction == FACETS_ANCHOR_DIRECTION_BACKWARD && facets->anchor.start_ut && facets->anchor.start_ut < facets->anchor.stop_ut) ||
-            (facets->anchor.direction == FACETS_ANCHOR_DIRECTION_FORWARD && facets->anchor.stop_ut && facets->anchor.stop_ut < facets->anchor.start_ut)) {
-        internal_error(true, "start and stop anchors are flipped");
-        facets->anchor.start_ut = stop_ut;
-        facets->anchor.stop_ut = start_ut;
-    }
-}
-
-void facets_enable_slice_mode(FACETS *facets) {
-    facets->options |= FACETS_OPTION_DONT_SEND_EMPTY_VALUE_FACETS | FACETS_OPTION_SORT_FACETS_ALPHABETICALLY;
-}
-
-inline FACET_KEY *facets_register_facet_id(FACETS *facets, const char *key_id, FACET_KEY_OPTIONS options) {
-    if(!is_valid_string_hash(key_id))
-        return NULL;
-
-    FACETS_HASH hash = str_to_facets_hash(key_id);
-
-    internal_error(strcmp(hash_to_static_string(hash), key_id) != 0,
-                   "Regenerating the user supplied key, does not produce the same hash string");
-
-    FACET_KEY *k = FACETS_KEY_ADD_TO_INDEX(facets, hash, NULL, 0, options);
-    k->options |= FACET_KEY_OPTION_FACET;
-    k->options &= ~FACET_KEY_OPTION_NO_FACET;
-    facet_key_late_init(facets, k);
-
-    return k;
-}
-
-void facets_register_facet_id_filter(FACETS *facets, const char *key_id, char *value_id, FACET_KEY_OPTIONS options) {
-    FACET_KEY *k = facets_register_facet_id(facets, key_id, options);
-    if(k) {
-        if(is_valid_string_hash(value_id)) {
-            k->default_selected_for_values = false;
-            FACET_VALUE_ADD_OR_UPDATE_SELECTED(k, str_to_facets_hash(value_id));
-        }
-    }
-}
-
-void facets_set_current_row_severity(FACETS *facets, FACET_ROW_SEVERITY severity) {
-    facets->current_row.severity = severity;
-}
-
-void facets_register_row_severity(FACETS *facets, facet_row_severity_t cb, void *data) {
-    facets->severity.cb = cb;
-    facets->severity.data = data;
-}
-
-void facets_set_additional_options(FACETS *facets, FACETS_OPTIONS options) {
-    facets->options |= options;
-}
-
-// ----------------------------------------------------------------------------
-
-static inline void facets_key_set_unsampled_value(FACETS *facets, FACET_KEY *k) {
-    if(likely(!facet_key_value_updated(k) && facets->keys_in_row.used < FACETS_KEYS_IN_ROW_MAX))
-        facets->keys_in_row.array[facets->keys_in_row.used++] = k;
-
-    k->current_value.flags |= FACET_KEY_VALUE_UPDATED | FACET_KEY_VALUE_UNSAMPLED;
-
-    facets->operations.values.registered++;
-    facets->operations.values.unsampled++;
-
-    // no need to copy the UNSET value
-    // empty values are exported as empty
-    k->current_value.raw = NULL;
-    k->current_value.raw_len = 0;
-    k->current_value.b->len = 0;
-    k->current_value.flags &= ~FACET_KEY_VALUE_COPIED;
-
-    if(unlikely(k->values.enabled))
-        FACET_VALUE_ADD_UNSAMPLED_VALUE_TO_INDEX(k);
-    else {
-        k->key_found_in_row++;
-        k->key_values_selected_in_row++;
-    }
-}
-
-static inline void facets_key_set_empty_value(FACETS *facets, FACET_KEY *k) {
-    if(likely(!facet_key_value_updated(k) && facets->keys_in_row.used < FACETS_KEYS_IN_ROW_MAX))
-        facets->keys_in_row.array[facets->keys_in_row.used++] = k;
-
-    k->current_value.flags |= FACET_KEY_VALUE_UPDATED | FACET_KEY_VALUE_EMPTY;
-
-    facets->operations.values.registered++;
-    facets->operations.values.empty++;
-
-    // no need to copy the UNSET value
-    // empty values are exported as empty
-    k->current_value.raw = NULL;
-    k->current_value.raw_len = 0;
-    k->current_value.b->len = 0;
-    k->current_value.flags &= ~FACET_KEY_VALUE_COPIED;
-
-    if(unlikely(k->values.enabled))
-        FACET_VALUE_ADD_EMPTY_VALUE_TO_INDEX(k);
-    else {
-        k->key_found_in_row++;
-        k->key_values_selected_in_row++;
-    }
-}
-
-static inline void facets_key_check_value(FACETS *facets, FACET_KEY *k) {
-    if(likely(!facet_key_value_updated(k) && facets->keys_in_row.used < FACETS_KEYS_IN_ROW_MAX))
-        facets->keys_in_row.array[facets->keys_in_row.used++] = k;
-
-    k->current_value.flags |= FACET_KEY_VALUE_UPDATED;
-    k->current_value.flags &= ~(FACET_KEY_VALUE_EMPTY|FACET_KEY_VALUE_UNSAMPLED|FACET_KEY_VALUE_ESTIMATED);
-
-    facets->operations.values.registered++;
-
-    if(k->transform.cb && !k->transform.view_only) {
-        facets->operations.values.transformed++;
-        facets_key_value_copy_to_buffer(k);
-        k->transform.cb(facets, k->current_value.b, FACETS_TRANSFORM_VALUE, k->transform.data);
-    }
-
-//    bool found = false;
-//    if(strstr(buffer_tostring(k->current_value), "fprintd") != NULL)
-//        found = true;
-
-    if(facets->query && !facet_key_value_empty_or_unsampled_or_estimated(k) && ((k->options & FACET_KEY_OPTION_FTS) || facets->options & FACETS_OPTION_ALL_KEYS_FTS)) {
-        facets->operations.fts.searches++;
-        facets_key_value_copy_to_buffer(k);
-        switch(simple_pattern_matches_extract(facets->query, buffer_tostring(k->current_value.b), NULL, 0)) {
-            case SP_MATCHED_POSITIVE:
-                facets->current_row.keys_matched_by_query_positive++;
-                break;
-
-            case SP_MATCHED_NEGATIVE:
-                facets->current_row.keys_matched_by_query_negative++;
-                break;
-
-            case SP_NOT_MATCHED:
-                break;
-        }
-    }
-
-    if(k->values.enabled)
-        FACET_VALUE_ADD_CURRENT_VALUE_TO_INDEX(k);
-    else {
-        k->key_found_in_row++;
-        k->key_values_selected_in_row++;
-    }
-}
-
-void facets_add_key_value(FACETS *facets, const char *key, const char *value) {
-    FACET_KEY *k = facets_register_key_name(facets, key, 0);
-    k->current_value.raw = value;
-    k->current_value.raw_len = strlen(value);
-
-    facets_key_check_value(facets, k);
-}
-
-void facets_add_key_value_length(FACETS *facets, const char *key, size_t key_len, const char *value, size_t value_len) {
-    FACET_KEY *k = facets_register_key_name_length(facets, key, key_len, 0);
-    k->current_value.raw = value;
-    k->current_value.raw_len = value_len;
-
-    facets_key_check_value(facets, k);
-}
-
-// ----------------------------------------------------------------------------
-// FACET_ROW dictionary hooks
-
-static void facet_row_key_value_insert_callback(const DICTIONARY_ITEM *item __maybe_unused, void *value, void *data) {
-    FACET_ROW_KEY_VALUE *rkv = value;
-    FACET_ROW *row = data; (void)row;
-
-    rkv->wb = buffer_create(0, NULL);
-    if(!rkv->empty)
-        buffer_contents_replace(rkv->wb, rkv->tmp, rkv->tmp_len);
-}
-
-static bool facet_row_key_value_conflict_callback(const DICTIONARY_ITEM *item __maybe_unused, void *old_value, void *new_value, void *data) {
-    FACET_ROW_KEY_VALUE *rkv = old_value;
-    FACET_ROW_KEY_VALUE *n_rkv = new_value;
-    FACET_ROW *row = data; (void)row;
-
-    rkv->empty = n_rkv->empty;
-
-    if(!rkv->empty)
-        buffer_contents_replace(rkv->wb, n_rkv->tmp, n_rkv->tmp_len);
-    else
-        buffer_flush(rkv->wb);
-
-    return false;
-}
-
-static void facet_row_key_value_delete_callback(const DICTIONARY_ITEM *item __maybe_unused, void *value, void *data) {
-    FACET_ROW_KEY_VALUE *rkv = value;
-    FACET_ROW *row = data; (void)row;
-
-    buffer_free(rkv->wb);
-}
-
-// ----------------------------------------------------------------------------
-// FACET_ROW management
-
-static void facets_row_free(FACETS *facets __maybe_unused, FACET_ROW *row) {
-    dictionary_destroy(row->dict);
-    freez(row);
-}
-
-static FACET_ROW *facets_row_create(FACETS *facets, usec_t usec, FACET_ROW *into) {
-    FACET_ROW *row;
-
-    if(into) {
-        row = into;
-        facets->operations.rows.reused++;
-    }
-    else {
-        row = callocz(1, sizeof(FACET_ROW));
-        row->dict = dictionary_create_advanced(DICT_OPTION_SINGLE_THREADED|DICT_OPTION_DONT_OVERWRITE_VALUE|DICT_OPTION_FIXED_SIZE, NULL, sizeof(FACET_ROW_KEY_VALUE));
-        dictionary_register_insert_callback(row->dict, facet_row_key_value_insert_callback, row);
-        dictionary_register_conflict_callback(row->dict, facet_row_key_value_conflict_callback, row);
-        dictionary_register_delete_callback(row->dict, facet_row_key_value_delete_callback, row);
-        facets->operations.rows.created++;
-    }
-
-    row->severity = facets->current_row.severity;
-    row->usec = usec;
-
-    FACET_KEY *k;
-    foreach_key_in_facets(facets, k) {
-        FACET_ROW_KEY_VALUE t = {
-                .tmp = NULL,
-                .tmp_len = 0,
-                .wb = NULL,
-                .empty = true,
-        };
-
-        if(facet_key_value_updated(k) && !facet_key_value_empty_or_unsampled_or_estimated(k)) {
-            t.tmp = facets_key_get_value(k);
-            t.tmp_len = facets_key_get_value_length(k);
-            t.empty = false;
-        }
-
-        dictionary_set(row->dict, k->name, &t, sizeof(t));
-    }
-    foreach_key_in_facets_done(k);
-
-    return row;
-}
-
-// ----------------------------------------------------------------------------
-
-static inline FACET_ROW *facets_row_keep_seek_to_position(FACETS *facets, usec_t usec) {
-    if(usec < facets->base->prev->usec)
-        return facets->base->prev;
-
-    if(usec > facets->base->usec)
-        return facets->base;
-
-    FACET_ROW *last = facets->operations.last_added;
-    while(last->prev != facets->base->prev && usec > last->prev->usec) {
-        last = last->prev;
-        facets->operations.backwards++;
-    }
-
-    while(last->next && usec < last->next->usec) {
-        last = last->next;
-        facets->operations.forwards++;
-    }
-
-    return last;
-}
-
-static void facets_row_keep_first_entry(FACETS *facets, usec_t usec) {
-    facets->operations.last_added = facets_row_create(facets, usec, NULL);
-    DOUBLE_LINKED_LIST_APPEND_ITEM_UNSAFE(facets->base, facets->operations.last_added, prev, next);
-    facets->items_to_return++;
-    facets->operations.first++;
-}
-
-static inline bool facets_is_entry_within_anchor(FACETS *facets, usec_t usec) {
-    if(facets->anchor.start_ut || facets->anchor.stop_ut) {
-        // we have an anchor key
-        // we don't want to keep rows on the other side of the direction
-
-        switch (facets->anchor.direction) {
-            default:
-            case FACETS_ANCHOR_DIRECTION_BACKWARD:
-                // we need to keep only the smaller timestamps
-                if (facets->anchor.start_ut && usec >= facets->anchor.start_ut) {
-                    facets->operations.skips_before++;
-                    return false;
-                }
-                if (facets->anchor.stop_ut && usec <= facets->anchor.stop_ut) {
-                    facets->operations.skips_after++;
-                    return false;
-                }
-                break;
-
-            case FACETS_ANCHOR_DIRECTION_FORWARD:
-                // we need to keep only the bigger timestamps
-                if (facets->anchor.start_ut && usec <= facets->anchor.start_ut) {
-                    facets->operations.skips_after++;
-                    return false;
-                }
-                if (facets->anchor.stop_ut && usec >= facets->anchor.stop_ut) {
-                    facets->operations.skips_before++;
-                    return false;
-                }
-                break;
-        }
-    }
-
-    return true;
-}
-
-bool facets_row_candidate_to_keep(FACETS *facets, usec_t usec) {
-    return !facets->base ||
-            (usec >= facets->base->prev->usec && usec <= facets->base->usec && facets_is_entry_within_anchor(facets, usec)) ||
-            facets->items_to_return < facets->max_items_to_return;
-}
-
-static void facets_row_keep(FACETS *facets, usec_t usec) {
-    facets->operations.rows.matched++;
-
-    if(unlikely(!facets->base)) {
-        // the first row to keep
-        facets_row_keep_first_entry(facets, usec);
-        return;
-    }
-
-    FACET_ROW *closest = facets_row_keep_seek_to_position(facets, usec);
-    FACET_ROW *to_replace = NULL;
-
-    if(likely(facets->items_to_return >= facets->max_items_to_return)) {
-        // we have enough items to return already
-
-        switch(facets->anchor.direction) {
-            default:
-            case FACETS_ANCHOR_DIRECTION_BACKWARD:
-                if(closest == facets->base->prev && usec < closest->usec) {
-                    // this is to the end of the list, belonging to the next page
-                    facets->operations.skips_after++;
-                    return;
-                }
-
-                // it seems we need to remove an item - the last one
-                to_replace = facets->base->prev;
-                if(closest == to_replace)
-                    closest = to_replace->prev;
-
-                break;
-
-            case FACETS_ANCHOR_DIRECTION_FORWARD:
-                if(closest == facets->base && usec > closest->usec) {
-                    // this is to the beginning of the list, belonging to the next page
-                    facets->operations.skips_before++;
-                    return;
-                }
-
-                // it seems we need to remove an item - the first one
-                to_replace = facets->base;
-                if(closest == to_replace)
-                    closest = to_replace->next;
-
-                break;
-        }
-
-        facets->operations.shifts++;
-        facets->items_to_return--;
-        DOUBLE_LINKED_LIST_REMOVE_ITEM_UNSAFE(facets->base, to_replace, prev, next);
-    }
-
-    internal_fatal(!closest, "FACETS: closest cannot be NULL");
-    internal_fatal(closest == to_replace, "FACETS: closest cannot be the same as to_replace");
-
-    facets->operations.last_added = facets_row_create(facets, usec, to_replace);
-
-    if(usec < closest->usec) {
-        DOUBLE_LINKED_LIST_INSERT_ITEM_AFTER_UNSAFE(facets->base, closest, facets->operations.last_added, prev, next);
-        facets->operations.appends++;
-    }
-    else {
-        DOUBLE_LINKED_LIST_INSERT_ITEM_BEFORE_UNSAFE(facets->base, closest, facets->operations.last_added, prev, next);
-        facets->operations.prepends++;
-    }
-
-    facets->items_to_return++;
-}
-
-static inline void facets_reset_key(FACET_KEY *k) {
-    k->key_found_in_row = 0;
-    k->key_values_selected_in_row = 0;
-    k->current_value.flags = FACET_KEY_VALUE_NONE;
-    k->current_value.hash = FACETS_HASH_ZERO;
-}
-
-static void facets_reset_keys_with_value_and_row(FACETS *facets) {
-    size_t entries = facets->keys_in_row.used;
-
-    for(size_t p = 0; p < entries ;p++) {
-        FACET_KEY *k = facets->keys_in_row.array[p];
-        facets_reset_key(k);
-    }
-
-    facets->current_row.severity = FACET_ROW_SEVERITY_NORMAL;
-    facets->current_row.keys_matched_by_query_positive = 0;
-    facets->current_row.keys_matched_by_query_negative = 0;
-    facets->keys_in_row.used = 0;
-}
-
-void facets_rows_begin(FACETS *facets) {
-    FACET_KEY *k;
-    foreach_key_in_facets(facets, k) {
-        facets_reset_key(k);
-    }
-    foreach_key_in_facets_done(k);
-
-    facets->keys_in_row.used = 0;
-    facets_reset_keys_with_value_and_row(facets);
-}
-
-bool facets_row_finished(FACETS *facets, usec_t usec) {
-    facets->operations.rows.evaluated++;
-
-    if(unlikely((facets->query && facets->keys_filtered_by_query &&
-                (!facets->current_row.keys_matched_by_query_positive || facets->current_row.keys_matched_by_query_negative)) ||
-                (facets->timeframe.before_ut && usec > facets->timeframe.before_ut) ||
-                (facets->timeframe.after_ut && usec < facets->timeframe.after_ut))) {
-        // this row is not useful
-        // 1. not matched by full text search, or
-        // 2. not in our timeframe
-        facets_reset_keys_with_value_and_row(facets);
-        return false;
-    }
-
-    bool within_anchor = facets_is_entry_within_anchor(facets, usec);
-    if(unlikely(!within_anchor && (facets->options & FACETS_OPTION_DATA_ONLY))) {
-        facets_reset_keys_with_value_and_row(facets);
-        return false;
-    }
-
-    size_t entries = facets->keys_with_values.used;
-    size_t total_keys = 0;
-    size_t selected_keys = 0;
-
-    for(size_t p = 0; p < entries ;p++) {
-        FACET_KEY *k = facets->keys_with_values.array[p];
-
-        if(!facet_key_value_updated(k)) {
-            // put the FACET_VALUE_UNSET value into it
-            facets_key_set_empty_value(facets, k);
-        }
-
-        total_keys++;
-
-        if(k->key_values_selected_in_row)
-            selected_keys++;
-
-        if(unlikely(!facets->histogram.key && facets->histogram.hash == k->hash))
-            facets->histogram.key = k;
-    }
-
-    if(selected_keys >= total_keys - 1) {
-        size_t found = 0;
-        (void) found;
-
-        for(size_t p = 0; p < entries; p++) {
-            FACET_KEY *k = facets->keys_with_values.array[p];
-
-            size_t counted_by = selected_keys;
-
-            if(counted_by != total_keys && !k->key_values_selected_in_row)
-                counted_by++;
-
-            if(counted_by == total_keys) {
-                k->current_value.v->final_facet_value_counter++;
-                found++;
-            }
-        }
-
-        internal_fatal(!found, "We should find at least one facet to count this row");
-    }
-
-    if(selected_keys == total_keys) {
-        // we need to keep this row
-        facets_histogram_update_value(facets, usec);
-
-        if(within_anchor)
-            facets_row_keep(facets, usec);
-    }
-
-    facets_reset_keys_with_value_and_row(facets);
-
-    return selected_keys == total_keys;
-}
-
-// ----------------------------------------------------------------------------
-// output
-
-const char *facets_severity_to_string(FACET_ROW_SEVERITY severity) {
-    switch(severity) {
-        default:
-        case FACET_ROW_SEVERITY_NORMAL:
-            return "normal";
-
-        case FACET_ROW_SEVERITY_DEBUG:
-            return "debug";
-
-        case FACET_ROW_SEVERITY_NOTICE:
-            return "notice";
-
-        case FACET_ROW_SEVERITY_WARNING:
-            return "warning";
-
-        case FACET_ROW_SEVERITY_CRITICAL:
-            return "critical";
-    }
-}
-
-void facets_accepted_parameters_to_json_array(FACETS *facets, BUFFER *wb, bool with_keys) {
-    buffer_json_member_add_array(wb, "accepted_params");
-    {
-        if(facets->accepted_params) {
-            void *t;
-            dfe_start_read(facets->accepted_params, t) {
-                buffer_json_add_array_item_string(wb, t_dfe.name);
-            }
-            dfe_done(t);
-        }
-
-        if(with_keys) {
-            FACET_KEY *k;
-            foreach_key_in_facets(facets, k){
-                if (!k->values.enabled)
-                    continue;
-
-                buffer_json_add_array_item_string(wb, hash_to_static_string(k->hash));
-            }
-            foreach_key_in_facets_done(k);
-        }
-    }
-    buffer_json_array_close(wb); // accepted_params
-}
-
-static int facets_keys_reorder_compar(const void *a, const void *b) {
-    const FACET_KEY *ak = *((const FACET_KEY **)a);
-    const FACET_KEY *bk = *((const FACET_KEY **)b);
-
-    const char *an = ak->name;
-    const char *bn = bk->name;
-
-    if(!an) an = "0";
-    if(!bn) bn = "0";
-
-    while(*an && ispunct(*an)) an++;
-    while(*bn && ispunct(*bn)) bn++;
-
-    return strcasecmp(an, bn);
-}
-
-void facets_sort_and_reorder_keys(FACETS *facets) {
-    size_t entries = facets->keys_with_values.used;
-    if(!entries)
-        return;
-
-    FACET_KEY *keys[entries];
-    memcpy(keys, facets->keys_with_values.array, sizeof(FACET_KEY *) * entries);
-
-    qsort(keys, entries, sizeof(FACET_KEY *), facets_keys_reorder_compar);
-
-    for(size_t i = 0; i < entries ;i++)
-        keys[i]->order = i + 1;
-}
-
-static int facets_key_values_reorder_by_name_compar(const void *a, const void *b) {
-    const FACET_VALUE *av = *((const FACET_VALUE **)a);
-    const FACET_VALUE *bv = *((const FACET_VALUE **)b);
-
-    const char *an = (av->name && av->name_len) ? av->name : "0";
-    const char *bn = (bv->name && bv->name_len) ? bv->name : "0";
-
-    while(*an && ispunct(*an)) an++;
-    while(*bn && ispunct(*bn)) bn++;
-
-    int ret = strcasecmp(an, bn);
-    return ret;
-}
-
-static int facets_key_values_reorder_by_count_compar(const void *a, const void *b) {
-    const FACET_VALUE *av = *((const FACET_VALUE **)a);
-    const FACET_VALUE *bv = *((const FACET_VALUE **)b);
-
-    if(av->final_facet_value_counter < bv->final_facet_value_counter)
-        return 1;
-
-    if(av->final_facet_value_counter > bv->final_facet_value_counter)
-        return -1;
-
-    return facets_key_values_reorder_by_name_compar(a, b);
-}
-
-static int facets_key_values_reorder_by_name_numeric_compar(const void *a, const void *b) {
-    const FACET_VALUE *av = *((const FACET_VALUE **)a);
-    const FACET_VALUE *bv = *((const FACET_VALUE **)b);
-
-    const char *an = (av->name && av->name_len) ? av->name : "0";
-    const char *bn = (bv->name && bv->name_len) ? bv->name : "0";
-
-    if(strcmp(an, FACET_VALUE_UNSET) == 0) an = "0";
-    if(strcmp(bn, FACET_VALUE_UNSET) == 0) bn = "0";
-
-    int64_t ad = str2ll(an, NULL);
-    int64_t bd = str2ll(bn, NULL);
-
-    if(ad < bd)
-        return -1;
-
-    if(ad > bd)
-        return 1;
-
-    return facets_key_values_reorder_by_name_compar(a, b);
-}
-
-static uint32_t facets_sort_and_reorder_values_internal(FACET_KEY *k) {
-    bool all_values_numeric = true;
-    size_t entries = k->values.used;
-    FACET_VALUE *values[entries], *v;
-    uint32_t used = 0;
-    foreach_value_in_key(k, v) {
-        if((k->facets->options & FACETS_OPTION_DONT_SEND_EMPTY_VALUE_FACETS) && v->empty)
-            continue;
-
-        if(all_values_numeric && !v->empty && v->name && v->name_len) {
-            const char *s = v->name;
-            while(isdigit(*s)) s++;
-            if(*s != '\0')
-                all_values_numeric = false;
-        }
-
-        values[used++] = v;
-
-        if(used >= entries)
-            break;
-    }
-    foreach_value_in_key_done(v);
-
-    if(!used)
-        return 0;
-
-    if(k->facets->options & FACETS_OPTION_SORT_FACETS_ALPHABETICALLY) {
-        if(all_values_numeric)
-            qsort(values, used, sizeof(FACET_VALUE *), facets_key_values_reorder_by_name_numeric_compar);
-        else
-            qsort(values, used, sizeof(FACET_VALUE *), facets_key_values_reorder_by_name_compar);
-    }
-    else
-        qsort(values, used, sizeof(FACET_VALUE *), facets_key_values_reorder_by_count_compar);
-
-    for(size_t i = 0; i < used; i++)
-        values[i]->order = i + 1;
-
-    return used;
-}
-
-static uint32_t facets_sort_and_reorder_values(FACET_KEY *k) {
-    if(!k->values.enabled || !k->values.ll || !k->values.used)
-        return 0;
-
-    if(!k->transform.cb || !k->transform.view_only || !(k->facets->options & FACETS_OPTION_SORT_FACETS_ALPHABETICALLY))
-        return facets_sort_and_reorder_values_internal(k);
-
-    // we have a transformation and has to be sorted alphabetically
-
-    BUFFER *tb = buffer_create(0, NULL);
-    uint32_t ret = 0;
-
-    size_t entries = k->values.used;
-    struct {
-        const char *name;
-        uint32_t name_len;
-    } values[entries];
-    FACET_VALUE *v;
-    uint32_t used = 0;
-
-    foreach_value_in_key(k, v) {
-        if(used >= entries)
-            break;
-
-        values[used].name = v->name;
-        values[used].name_len = v->name_len;
-        used++;
-
-        facets_key_value_transformed(k->facets, k, v, tb, FACETS_TRANSFORM_FACET_SORT);
-        v->name = strdupz(buffer_tostring(tb));
-        v->name_len = buffer_strlen(tb);
-    }
-    foreach_value_in_key_done(v);
-
-    ret = facets_sort_and_reorder_values_internal(k);
-
-    used = 0;
-    foreach_value_in_key(k, v) {
-        if(used >= entries)
-            break;
-
-        freez((void *)v->name);
-        v->name = values[used].name;
-        v->name_len = values[used].name_len;
-        used++;
-    }
-    foreach_value_in_key_done(v);
-
-    buffer_free(tb);
-    return ret;
-}
-
-void facets_table_config(BUFFER *wb) {
-    buffer_json_member_add_boolean(wb, "show_ids", false);   // do not show the column ids to the user
-    buffer_json_member_add_boolean(wb, "has_history", true); // enable date-time picker with after-before
-
-    buffer_json_member_add_object(wb, "pagination");
-    {
-        buffer_json_member_add_boolean(wb, "enabled", true);
-        buffer_json_member_add_string(wb, "key", "anchor");
-        buffer_json_member_add_string(wb, "column", "timestamp");
-        buffer_json_member_add_string(wb, "units", "timestamp_usec");
-    }
-    buffer_json_object_close(wb); // pagination
-}
-
-void facets_report(FACETS *facets, BUFFER *wb, DICTIONARY *used_hashes_registry) {
-    facets->report.used_hashes_registry = used_hashes_registry;
-
-    if(!(facets->options & FACETS_OPTION_DATA_ONLY)) {
-        facets_table_config(wb);
-        facets_accepted_parameters_to_json_array(facets, wb, true);
-    }
-
-    // ------------------------------------------------------------------------
-    // facets
-
-    if(!(facets->options & FACETS_OPTION_DONT_SEND_FACETS)) {
-        bool show_facets = false;
-
-        if(facets->options & FACETS_OPTION_DATA_ONLY) {
-            if(facets->options & FACETS_OPTION_SHOW_DELTAS) {
-                buffer_json_member_add_array(wb, "facets_delta");
-                show_facets = true;
-            }
-        }
-        else {
-            buffer_json_member_add_array(wb, "facets");
-            show_facets = true;
-        }
-
-        if(show_facets) {
-            CLEAN_BUFFER *tb = buffer_create(0, NULL);
-            FACET_KEY *k;
-            foreach_key_in_facets(facets, k) {
-                if(!k->values.enabled)
-                    continue;
-
-                if(!facets_sort_and_reorder_values(k))
-                    // no values for this key
-                    continue;
-
-                buffer_json_add_array_item_object(wb); // key
-                {
-                    buffer_json_member_add_string(wb, "id", hash_to_static_string(k->hash));
-                    buffer_json_member_add_string(wb, "name", facets_key_name_cached(k
-                                                                                     , facets->report.used_hashes_registry
-                                                                                    ));
-
-                    if(!k->order) k->order = facets->order++;
-                    buffer_json_member_add_uint64(wb, "order", k->order);
-
-                    buffer_json_member_add_array(wb, "options");
-                    {
-                        FACET_VALUE *v;
-                        foreach_value_in_key(k, v) {
-                            if((facets->options & FACETS_OPTION_DONT_SEND_EMPTY_VALUE_FACETS) && v->empty)
-                                continue;
-
-                            if(v->unsampled || v->estimated)
-                                continue;
-
-                            buffer_json_add_array_item_object(wb);
-                            {
-                                buffer_json_member_add_string(wb, "id", hash_to_static_string(v->hash));
-
-                                facets_key_value_transformed(facets, k, v, tb, FACETS_TRANSFORM_FACET);
-                                buffer_json_member_add_string(wb, "name", buffer_tostring(tb));
-                                buffer_json_member_add_uint64(wb, "count", v->final_facet_value_counter);
-                                buffer_json_member_add_uint64(wb, "order", v->order);
-                            }
-                            buffer_json_object_close(wb);
-                        }
-                        foreach_value_in_key_done(v);
-                    }
-                    buffer_json_array_close(wb); // options
-                }
-                buffer_json_object_close(wb); // key
-            }
-            foreach_key_in_facets_done(k);
-            buffer_json_array_close(wb); // facets
-        }
-    }
-
-    // ------------------------------------------------------------------------
-    // columns
-
-    buffer_json_member_add_object(wb, "columns");
-    {
-        size_t field_id = 0;
-        buffer_rrdf_table_add_field(
-                wb, field_id++,
-                "timestamp", "Timestamp",
-                RRDF_FIELD_TYPE_TIMESTAMP,
-                RRDF_FIELD_VISUAL_VALUE,
-                RRDF_FIELD_TRANSFORM_DATETIME_USEC, 0, NULL, NAN,
-                RRDF_FIELD_SORT_DESCENDING|RRDF_FIELD_SORT_FIXED,
-                NULL,
-                RRDF_FIELD_SUMMARY_COUNT,
-                RRDF_FIELD_FILTER_RANGE,
-                RRDF_FIELD_OPTS_WRAP | RRDF_FIELD_OPTS_VISIBLE | RRDF_FIELD_OPTS_UNIQUE_KEY,
-                NULL);
-
-        buffer_rrdf_table_add_field(
-                wb, field_id++,
-                "rowOptions", "rowOptions",
-                RRDF_FIELD_TYPE_NONE,
-                RRDR_FIELD_VISUAL_ROW_OPTIONS,
-                RRDF_FIELD_TRANSFORM_NONE, 0, NULL, NAN,
-                RRDF_FIELD_SORT_FIXED,
-                NULL,
-                RRDF_FIELD_SUMMARY_COUNT,
-                RRDF_FIELD_FILTER_NONE,
-                RRDF_FIELD_OPTS_DUMMY,
-                NULL);
-
-        FACET_KEY *k;
-        foreach_key_in_facets(facets, k) {
-                    RRDF_FIELD_OPTIONS options = RRDF_FIELD_OPTS_WRAP;
-                    bool visible = k->options & (FACET_KEY_OPTION_VISIBLE | FACET_KEY_OPTION_STICKY);
-
-                    if ((facets->options & FACETS_OPTION_ALL_FACETS_VISIBLE && k->values.enabled))
-                        visible = true;
-
-                    if (!visible)
-                        visible = simple_pattern_matches(facets->visible_keys, k->name);
-
-                    if (visible)
-                        options |= RRDF_FIELD_OPTS_VISIBLE;
-
-                    if (k->options & FACET_KEY_OPTION_MAIN_TEXT)
-                        options |= RRDF_FIELD_OPTS_FULL_WIDTH | RRDF_FIELD_OPTS_WRAP;
-
-                    if (k->options & FACET_KEY_OPTION_EXPANDED_FILTER)
-                        options |= RRDF_FIELD_OPTS_EXPANDED_FILTER;
-
-                    const char *hash_str = hash_to_static_string(k->hash);
-
-                    buffer_rrdf_table_add_field(
-                            wb, field_id++,
-                            hash_str, k->name ? k->name : hash_str,
-                            RRDF_FIELD_TYPE_STRING,
-                            (k->options & FACET_KEY_OPTION_RICH_TEXT) ? RRDF_FIELD_VISUAL_RICH : RRDF_FIELD_VISUAL_VALUE,
-                            RRDF_FIELD_TRANSFORM_NONE, 0, NULL, NAN,
-                            RRDF_FIELD_SORT_FIXED,
-                            NULL,
-                            RRDF_FIELD_SUMMARY_COUNT,
-                            (k->options & FACET_KEY_OPTION_NEVER_FACET) ? RRDF_FIELD_FILTER_NONE : RRDF_FIELD_FILTER_FACET,
-                            options, FACET_VALUE_UNSET);
-                }
-        foreach_key_in_facets_done(k);
-    }
-    buffer_json_object_close(wb); // columns
-
-    // ------------------------------------------------------------------------
-    // rows data
-
-    buffer_json_member_add_array(wb, "data");
-    {
-        usec_t last_usec = 0; (void)last_usec;
-
-        for(FACET_ROW *row = facets->base ; row ;row = row->next) {
-
-            internal_fatal(
-                    facets->anchor.start_ut && (
-                        (facets->anchor.direction == FACETS_ANCHOR_DIRECTION_BACKWARD && row->usec >= facets->anchor.start_ut) ||
-                        (facets->anchor.direction == FACETS_ANCHOR_DIRECTION_FORWARD && row->usec <= facets->anchor.start_ut)
-                    ), "Wrong data returned related to %s start anchor!", facets->anchor.direction == FACETS_ANCHOR_DIRECTION_FORWARD ? "forward" : "backward");
-
-            internal_fatal(last_usec && row->usec > last_usec, "Wrong order of data returned!");
-
-            last_usec = row->usec;
-
-            buffer_json_add_array_item_array(wb); // each row
-            buffer_json_add_array_item_uint64(wb, row->usec);
-            buffer_json_add_array_item_object(wb);
-            {
-                if(facets->severity.cb)
-                    row->severity = facets->severity.cb(facets, row, facets->severity.data);
-
-                buffer_json_member_add_string(wb, "severity", facets_severity_to_string(row->severity));
-            }
-            buffer_json_object_close(wb);
-
-            FACET_KEY *k;
-            foreach_key_in_facets(facets, k) {
-                FACET_ROW_KEY_VALUE *rkv = dictionary_get(row->dict, k->name);
-
-                if(unlikely(k->dynamic.cb)) {
-                    if(unlikely(!rkv))
-                        rkv = dictionary_set(row->dict, k->name, NULL, sizeof(*rkv));
-
-                    k->dynamic.cb(facets, wb, rkv, row, k->dynamic.data);
-                    facets->operations.values.dynamic++;
-                }
-                else {
-                    if(!rkv || rkv->empty) {
-                        buffer_json_add_array_item_string(wb, NULL);
-                    }
-                    else if(unlikely(k->transform.cb && k->transform.view_only)) {
-                        k->transform.cb(facets, rkv->wb, FACETS_TRANSFORM_DATA, k->transform.data);
-                        buffer_json_add_array_item_string(wb, buffer_tostring(rkv->wb));
-                    }
-                    else
-                        buffer_json_add_array_item_string(wb, buffer_tostring(rkv->wb));
-                }
-            }
-            foreach_key_in_facets_done(k);
-            buffer_json_array_close(wb); // each row
-        }
-    }
-    buffer_json_array_close(wb); // data
-
-    if(!(facets->options & FACETS_OPTION_DATA_ONLY)) {
-        buffer_json_member_add_string(wb, "default_sort_column", "timestamp");
-        buffer_json_member_add_array(wb, "default_charts");
-        buffer_json_array_close(wb);
-    }
-
-    // ------------------------------------------------------------------------
-    // histogram
-
-    if(facets->histogram.enabled && !(facets->options & FACETS_OPTION_DONT_SEND_HISTOGRAM)) {
-        FACETS_HASH first_histogram_hash = 0;
-        buffer_json_member_add_array(wb, "available_histograms");
-        {
-            FACET_KEY *k;
-            foreach_key_in_facets(facets, k) {
-                if (!k->values.enabled)
-                    continue;
-
-                if(unlikely(!first_histogram_hash))
-                    first_histogram_hash = k->hash;
-
-                buffer_json_add_array_item_object(wb);
-                buffer_json_member_add_string(wb, "id", hash_to_static_string(k->hash));
-                buffer_json_member_add_string(wb, "name", k->name);
-                buffer_json_member_add_uint64(wb, "order", k->order);
-                buffer_json_object_close(wb);
-            }
-            foreach_key_in_facets_done(k);
-        }
-        buffer_json_array_close(wb);
-
-        {
-            FACET_KEY *k = FACETS_KEY_GET_FROM_INDEX(facets, facets->histogram.hash);
-            if(!k || !k->values.enabled)
-                k = FACETS_KEY_GET_FROM_INDEX(facets, first_histogram_hash);
-
-            bool show_histogram = false;
-
-            if(facets->options & FACETS_OPTION_DATA_ONLY) {
-                if(facets->options & FACETS_OPTION_SHOW_DELTAS) {
-                    buffer_json_member_add_object(wb, "histogram_delta");
-                    show_histogram = true;
-                }
-            }
-            else {
-                buffer_json_member_add_object(wb, "histogram");
-                show_histogram = true;
-            }
-
-            if(show_histogram) {
-                buffer_json_member_add_string(wb, "id", k ? hash_to_static_string(k->hash) : "");
-                buffer_json_member_add_string(wb, "name", k ? k->name : "");
-                buffer_json_member_add_object(wb, "chart");
-                {
-                    facets_histogram_generate(facets, k, wb);
-                }
-                buffer_json_object_close(wb); // chart
-                buffer_json_object_close(wb); // histogram
-            }
-        }
-    }
-
-    // ------------------------------------------------------------------------
-    // items
-
-    bool show_items = false;
-    if(facets->options & FACETS_OPTION_DATA_ONLY) {
-        if(facets->options & FACETS_OPTION_SHOW_DELTAS) {
-            buffer_json_member_add_object(wb, "items_delta");
-            show_items = true;
-        }
-    }
-    else {
-        buffer_json_member_add_object(wb, "items");
-        show_items = true;
-    }
-
-    if(show_items) {
-        buffer_json_member_add_uint64(wb, "evaluated", facets->operations.rows.evaluated);
-        buffer_json_member_add_uint64(wb, "matched", facets->operations.rows.matched);
-        buffer_json_member_add_uint64(wb, "unsampled", facets->operations.rows.unsampled);
-        buffer_json_member_add_uint64(wb, "estimated", facets->operations.rows.estimated);
-        buffer_json_member_add_uint64(wb, "returned", facets->items_to_return);
-        buffer_json_member_add_uint64(wb, "max_to_return", facets->max_items_to_return);
-        buffer_json_member_add_uint64(wb, "before", facets->operations.skips_before);
-        buffer_json_member_add_uint64(wb, "after", facets->operations.skips_after + facets->operations.shifts);
-        buffer_json_object_close(wb); // items
-    }
-
-    // ------------------------------------------------------------------------
-    // stats
-
-    buffer_json_member_add_object(wb, "_stats");
-    {
-        buffer_json_member_add_uint64(wb, "first", facets->operations.first);
-        buffer_json_member_add_uint64(wb, "forwards", facets->operations.forwards);
-        buffer_json_member_add_uint64(wb, "backwards", facets->operations.backwards);
-        buffer_json_member_add_uint64(wb, "skips_before", facets->operations.skips_before);
-        buffer_json_member_add_uint64(wb, "skips_after", facets->operations.skips_after);
-        buffer_json_member_add_uint64(wb, "prepends", facets->operations.prepends);
-        buffer_json_member_add_uint64(wb, "appends", facets->operations.appends);
-        buffer_json_member_add_uint64(wb, "shifts", facets->operations.shifts);
-        buffer_json_member_add_object(wb, "rows");
-        {
-            buffer_json_member_add_uint64(wb, "created", facets->operations.rows.created);
-            buffer_json_member_add_uint64(wb, "reused", facets->operations.rows.reused);
-            buffer_json_member_add_uint64(wb, "evaluated", facets->operations.rows.evaluated);
-            buffer_json_member_add_uint64(wb, "matched", facets->operations.rows.matched);
-        }
-        buffer_json_object_close(wb); // rows
-        buffer_json_member_add_object(wb, "keys");
-        {
-            size_t resizes = 0, searches = 0, collisions = 0, used = 0, size = 0, count = 0;
-            count++;
-            used += facets->keys.ht.used;
-            size += facets->keys.ht.size;
-            resizes += facets->keys.ht.resizes;
-            searches += facets->keys.ht.searches;
-            collisions += facets->keys.ht.collisions;
-
-            buffer_json_member_add_uint64(wb, "registered", facets->operations.keys.registered);
-            buffer_json_member_add_uint64(wb, "unique", facets->operations.keys.unique);
-            buffer_json_member_add_uint64(wb, "hashtables", count);
-            buffer_json_member_add_uint64(wb, "hashtable_used", used);
-            buffer_json_member_add_uint64(wb, "hashtable_size", size);
-            buffer_json_member_add_uint64(wb, "hashtable_searches", searches);
-            buffer_json_member_add_uint64(wb, "hashtable_collisions", collisions);
-            buffer_json_member_add_uint64(wb, "hashtable_resizes", resizes);
-        }
-        buffer_json_object_close(wb); // keys
-        buffer_json_member_add_object(wb, "values");
-        {
-            size_t resizes = 0, searches = 0, collisions = 0, used = 0, size = 0, count = 0;
-            for(FACET_KEY *k = facets->keys.ll; k ; k = k->next) {
-                count++;
-                used += k->values.ht.used;
-                size += k->values.ht.size;
-                resizes += k->values.ht.resizes;
-                searches += k->values.ht.searches;
-                collisions += k->values.ht.collisions;
-            }
-
-            buffer_json_member_add_uint64(wb, "registered", facets->operations.values.registered);
-            buffer_json_member_add_uint64(wb, "transformed", facets->operations.values.transformed);
-            buffer_json_member_add_uint64(wb, "dynamic", facets->operations.values.dynamic);
-            buffer_json_member_add_uint64(wb, "empty", facets->operations.values.empty);
-            buffer_json_member_add_uint64(wb, "unsampled", facets->operations.values.unsampled);
-            buffer_json_member_add_uint64(wb, "estimated", facets->operations.values.estimated);
-            buffer_json_member_add_uint64(wb, "indexed", facets->operations.values.indexed);
-            buffer_json_member_add_uint64(wb, "inserts", facets->operations.values.inserts);
-            buffer_json_member_add_uint64(wb, "conflicts", facets->operations.values.conflicts);
-            buffer_json_member_add_uint64(wb, "hashtables", count);
-            buffer_json_member_add_uint64(wb, "hashtable_used", used);
-            buffer_json_member_add_uint64(wb, "hashtable_size", size);
-            buffer_json_member_add_uint64(wb, "hashtable_searches", searches);
-            buffer_json_member_add_uint64(wb, "hashtable_collisions", collisions);
-            buffer_json_member_add_uint64(wb, "hashtable_resizes", resizes);
-        }
-        buffer_json_object_close(wb); // values
-        buffer_json_member_add_object(wb, "fts");
-        {
-            buffer_json_member_add_uint64(wb, "searches", facets->operations.fts.searches);
-        }
-        buffer_json_object_close(wb); // fts
-    }
-    buffer_json_object_close(wb); // items
-}
diff --git a/libnetdata/facets/facets.h b/libnetdata/facets/facets.h
deleted file mode 100644
index 8364d8612..000000000
--- a/libnetdata/facets/facets.h
+++ /dev/null
@@ -1,128 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-#ifndef FACETS_H
-#define FACETS_H 1
-
-#include "../libnetdata.h"
-
-#define FACET_VALUE_UNSET "-"
-#define FACET_VALUE_UNSAMPLED "[unsampled]"
-#define FACET_VALUE_ESTIMATED "[estimated]"
-
-typedef enum __attribute__((packed)) {
-    FACETS_ANCHOR_DIRECTION_FORWARD,
-    FACETS_ANCHOR_DIRECTION_BACKWARD,
-} FACETS_ANCHOR_DIRECTION;
-
-typedef enum __attribute__((packed)) {
-    FACETS_TRANSFORM_VALUE,
-    FACETS_TRANSFORM_HISTOGRAM,
-    FACETS_TRANSFORM_FACET,
-    FACETS_TRANSFORM_DATA,
-    FACETS_TRANSFORM_FACET_SORT,
-} FACETS_TRANSFORMATION_SCOPE;
-
-typedef enum __attribute__((packed)) {
-    FACET_KEY_OPTION_FACET          = (1 << 0), // filterable values
-    FACET_KEY_OPTION_NO_FACET       = (1 << 1), // non-filterable value
-    FACET_KEY_OPTION_NEVER_FACET    = (1 << 2), // never enable this field as facet
-    FACET_KEY_OPTION_STICKY         = (1 << 3), // should be sticky in the table
-    FACET_KEY_OPTION_VISIBLE        = (1 << 4), // should be in the default table
-    FACET_KEY_OPTION_FTS            = (1 << 5), // the key is filterable by full text search (FTS)
-    FACET_KEY_OPTION_MAIN_TEXT      = (1 << 6), // full width and wrap
-    FACET_KEY_OPTION_RICH_TEXT      = (1 << 7),
-    FACET_KEY_OPTION_REORDER        = (1 << 8), // give the key a new order id on first encounter
-    FACET_KEY_OPTION_TRANSFORM_VIEW = (1 << 9), // when registering the transformation, do it only at the view, not on all data
-    FACET_KEY_OPTION_EXPANDED_FILTER = (1 << 10), // the presentation should have this filter expanded by default
-} FACET_KEY_OPTIONS;
-
-typedef enum __attribute__((packed)) {
-    FACET_ROW_SEVERITY_DEBUG,       // lowest - not important
-    FACET_ROW_SEVERITY_NORMAL,      // the default
-    FACET_ROW_SEVERITY_NOTICE,      // bold
-    FACET_ROW_SEVERITY_WARNING,     // yellow + bold
-    FACET_ROW_SEVERITY_CRITICAL,    // red + bold
-} FACET_ROW_SEVERITY;
-
-typedef struct facet_row_key_value {
-    const char *tmp;
-    uint32_t tmp_len;
-    bool empty;
-    BUFFER *wb;
-} FACET_ROW_KEY_VALUE;
-
-typedef struct facet_row {
-    usec_t usec;
-    DICTIONARY *dict;
-    FACET_ROW_SEVERITY severity;
-    struct facet_row *prev, *next;
-} FACET_ROW;
-
-typedef struct facets FACETS;
-typedef struct facet_key FACET_KEY;
-
-typedef void (*facets_key_transformer_t)(FACETS *facets __maybe_unused, BUFFER *wb, FACETS_TRANSFORMATION_SCOPE scope, void *data);
-typedef void (*facet_dynamic_row_t)(FACETS *facets, BUFFER *json_array, FACET_ROW_KEY_VALUE *rkv, FACET_ROW *row, void *data);
-typedef FACET_ROW_SEVERITY (*facet_row_severity_t)(FACETS *facets, FACET_ROW *row, void *data);
-FACET_KEY *facets_register_dynamic_key_name(FACETS *facets, const char *key, FACET_KEY_OPTIONS options, facet_dynamic_row_t cb, void *data);
-FACET_KEY *facets_register_key_name_transformation(FACETS *facets, const char *key, FACET_KEY_OPTIONS options, facets_key_transformer_t cb, void *data);
-void facets_register_row_severity(FACETS *facets, facet_row_severity_t cb, void *data);
-
-typedef enum __attribute__((packed)) {
-    FACETS_OPTION_ALL_FACETS_VISIBLE            = (1 << 0), // all facets should be visible by default in the table
-    FACETS_OPTION_ALL_KEYS_FTS                  = (1 << 1), // all keys are searchable by full text search
-    FACETS_OPTION_DONT_SEND_FACETS              = (1 << 2), // "facets" object will not be included in the report
-    FACETS_OPTION_DONT_SEND_HISTOGRAM           = (1 << 3), // "histogram" object will not be included in the report
-    FACETS_OPTION_DATA_ONLY                     = (1 << 4),
-    FACETS_OPTION_DONT_SEND_EMPTY_VALUE_FACETS  = (1 << 5), // empty facet values will not be included in the report
-    FACETS_OPTION_SORT_FACETS_ALPHABETICALLY    = (1 << 6),
-    FACETS_OPTION_SHOW_DELTAS                   = (1 << 7),
-} FACETS_OPTIONS;
-
-FACETS *facets_create(uint32_t items_to_return, FACETS_OPTIONS options, const char *visible_keys, const char *facet_keys, const char *non_facet_keys);
-void facets_destroy(FACETS *facets);
-
-void facets_accepted_param(FACETS *facets, const char *param);
-
-void facets_rows_begin(FACETS *facets);
-bool facets_row_finished(FACETS *facets, usec_t usec);
-
-void facets_row_finished_unsampled(FACETS *facets, usec_t usec);
-void facets_update_estimations(FACETS *facets, usec_t from_ut, usec_t to_ut, size_t entries);
-size_t facets_histogram_slots(FACETS *facets);
-
-FACET_KEY *facets_register_key_name(FACETS *facets, const char *key, FACET_KEY_OPTIONS options);
-void facets_set_query(FACETS *facets, const char *query);
-void facets_set_items(FACETS *facets, uint32_t items);
-void facets_set_anchor(FACETS *facets, usec_t start_ut, usec_t stop_ut, FACETS_ANCHOR_DIRECTION direction);
-void facets_enable_slice_mode(FACETS *facets);
-bool facets_row_candidate_to_keep(FACETS *facets, usec_t usec);
-
-FACET_KEY *facets_register_facet_id(FACETS *facets, const char *key_id, FACET_KEY_OPTIONS options);
-void facets_register_facet_id_filter(FACETS *facets, const char *key_id, char *value_id, FACET_KEY_OPTIONS options);
-void facets_set_timeframe_and_histogram_by_id(FACETS *facets, const char *key_id, usec_t after_ut, usec_t before_ut);
-void facets_set_timeframe_and_histogram_by_name(FACETS *facets, const char *key_name, usec_t after_ut, usec_t before_ut);
-
-void facets_add_key_value(FACETS *facets, const char *key, const char *value);
-void facets_add_key_value_length(FACETS *facets, const char *key, size_t key_len, const char *value, size_t value_len);
-
-void facets_report(FACETS *facets, BUFFER *wb, DICTIONARY *used_hashes_registry);
-void facets_accepted_parameters_to_json_array(FACETS *facets, BUFFER *wb, bool with_keys);
-void facets_set_current_row_severity(FACETS *facets, FACET_ROW_SEVERITY severity);
-void facets_set_additional_options(FACETS *facets, FACETS_OPTIONS options);
-
-bool facets_key_name_is_filter(FACETS *facets, const char *key);
-bool facets_key_name_is_facet(FACETS *facets, const char *key);
-bool facets_key_name_value_length_is_selected(FACETS *facets, const char *key, size_t key_length, const char *value, size_t value_length);
-void facets_add_possible_value_name_to_key(FACETS *facets, const char *key, size_t key_length, const char *value, size_t value_length);
-
-void facets_sort_and_reorder_keys(FACETS *facets);
-usec_t facets_row_oldest_ut(FACETS *facets);
-usec_t facets_row_newest_ut(FACETS *facets);
-uint32_t facets_rows(FACETS *facets);
-
-void facets_table_config(BUFFER *wb);
-
-const char *facets_severity_to_string(FACET_ROW_SEVERITY severity);
-
-#endif