In Zabbix >= v5.0 a similar information could be extracted with zabbix_server -R diaginfo=valuecache.
Application to look inside of the zabbix_server memory to get which data is being stored in the value cache.
In the -p parameter put the PID of the zabbix_server parent process.
If -analyze-items is enabled, it will scan all the value cache (the items hashset) to get which item ids are stored.
This could be expensive (~8s for 300k items.num_slots).
This will show the -number-of-top-items using most values and a histogram of how many values have each item.
The histogram will show only the itemids if the number is below -histogram-max-itemids.
Example histogram:
397 - 794: 76 items (11263010, 10905062, 11782312, 11780196, 8494850, 11781925, 9173251, ...)
It should be read as: there are 76 items which have between 397 and 794 values. The list between brackets are some of the item ids in that group.
If -show-items-details is enabled, show how many values has stored each item id.
Example:
# procmem-go -p 1115306 -analyze-items -show-items-details
-- zbx_vc_cache_t --
hits: 354133020315
misses: 563811816
mode: 0
mode_time: 1684493896
last_warning_time: 1684493756
items.num_slots: 298153
items.num_data: 127284
strpool.num_slots: 17431
strpool.num_data: 10206
Top 10 items by number of values stored:
4781209: 3580
10771467: 2903
11805164: 2689
9741033: 2682
9741013: 2680
9741016: 2679
11805160: 2679
9741036: 2678
9741037: 2676
9741005: 2676
Histogram, format: value range: N values (item ids)
0 - 397: 103148 items (10189858, 9540928, 8366577, 2377114, 8309433, 996421, 10922182, 916408, 12000161, 850179, ...)
397 - 794: 76 items (11780015, 7640584, 10905060, 11774248, 11775473, 11780025, 11575629, 11780615, 11262997, 11780605, ...)
794 - 1191: 9 items (1006320, 11773912, 10254382, 10796931, 11778314, 9305245, 10757228, 11781640, 11199034)
1191 - 1588: 62 items (11776488, 11776648, 11966214, 11776489, 11776543, 11774835, 11776490, 11776545, 11776479, 11776556, ...)
1588 - 1985: 95 items (11775721, 11775817, 11780368, 11775650, 11779392, 11775647, 11780203, 11775809, 11775641, 11775338, ...)
1985 - 2382: 347 items (11780520, 11780522, 11781839, 11779925, 11780602, 11781881, 11783972, 11780521, 11779942, 11774233, ...)
2382 - 2779: 11 items (11805158, 9741016, 9741005, 11805160, 9741036, 10757236, 9741033, 11805164, 9741037, 9741013, ...)
2779 - 3176: 1 items (10771467)
3176 - 3573: 0 items
3573 - 3970: 1 items (4781209)