качели "became not supported: Timeout was reached" И "became supported"

[zar]

подскажите, из-за чего могут быть такие качели в логах заббикса?
сделал выборку по одному item - cat zabbix_server.log | grep "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size"94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size

и наблюдаю что один и тот item то нормально отрабатывает то таймаут. Подскажите, куда смотреть, что капать?
выделил жирным пример

...........................
2232:20210205:111559.918 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG1_L24)]" became not supported: Timeout was reached
2231:20210205:111648.180 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG0_L21),pfree]" became not supported: Timeout was reached
2232:20210205:111649.182 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG0_L22),pfree]" became not supported: Timeout was reached
2232:20210205:111650.190 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid10(SATA_RG2_L25),pfree]" became not supported: Timeout was reached
2230:20210205:111651.191 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid10(SATA_RG2_L26),pfree]" became not supported: Timeout was reached
2231:20210205:111652.198 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG1_L23),pfree]" became not supported: Timeout was reached
2230:20210205:111653.199 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG1_L24),pfree]" became not supported: Timeout was reached
2230:20210205:111655.215 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG0_L21)]" became not supported: Timeout was reached
2229:20210205:111656.222 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG0_L22)]" became not supported: Timeout was reached
2229:20210205:111657.234 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid10(SATA_RG2_L25)]" became not supported: Timeout was reached
2229:20210205:111658.241 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid10(SATA_RG2_L26)]" became not supported: Timeout was reached
2230:20210205:111659.246 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG1_L23)]" became not supported: Timeout was reached
2230:20210205:112048.366 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG0_L21),pfree]" became supported
2229:20210205:112049.370 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG0_L22),pfree]" became supported
2232:20210205:112050.373 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid10(SATA_RG2_L25),pfree]" became supported
2229:20210205:112050.430 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid10(SATA_RG2_L26),pfree]" became supported
2232:20210205:112052.382 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG1_L23),pfree]" became supported
2232:20210205:112053.391 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG1_L24),pfree]" became supported
2230:20210205:112054.399 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG0_L21)]" became supported
2229:20210205:112055.439 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG0_L22)]" became supported
2232:20210205:112056.414 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid10(SATA_RG2_L25)]" became supported
2229:20210205:112058.445 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid10(SATA_RG2_L26)]" became supported
2231:20210205:112059.448 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG1_L23)]" became supported
2229:20210205:112100.453 item "94fbef7a-5654-11e0-ba8d-5cf3fc211214:vmware.hv.datastore.size[{$URL},{HOST.HOST},raid6(sas_RG1_L24)]" became supported

Zabbix 5.0.1.

[Hamardaban]

Написано по человечьи - таймаут.
За отведенный период времени не получен ответ на запрос метрики.
Далее вступает в действие механизм https://www.zabbix.com/documentation...unreachability
Копать в сторону параметра Timeout сервера ( того кто запрашивает )
осторожно! параметр влияет на многое. прочитайте документацию.