Zabbix

A.F....PS. [ZBXNEXT-6167,ZBXNEXT-6168] implemented ability to dump the history cache contents

* commit 'd3f8d33f65e69bfd43005630234d38a5019dcd68': (38 commits)
  .......PS. [ZBXNEXT-6167,ZBXNEXT-6168] increased indentation of memory bucket diaginfo logging
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] formatted result as null in case if task is not yet completed
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] formatted data response message as string
  .......... [ZBXNEXT-6167,ZBXNEXT-6168] fixed integration test
  .......... [ZBXNEXT-6167,ZBXNEXT-6168] reverted last changes
  .......... [ZBXNEXT-6167,ZBXNEXT-6168] modified integration tests for test purposes
  .......... [ZBXNEXT-6167,ZBXNEXT-6168] fixed docblock
  .......... [ZBXNEXT-6167,ZBXNEXT-6168] fixed integration tests
  .......... [ZBXNEXT-6167,ZBXNEXT-6168] fixed integration tests
  .......PS. [ZBXNEXT-6167] changed format of all statistics field request
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] removed unneeded type cast
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] removed redundant code
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] removed unneeded variables
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] replaced natural increase of IDs by bcadd
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] added check to prevent unneeded api request
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] fixed coding style
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] fixed coding style
  .......... [ZBXNEXT-6167,ZBXNEXT-6168] fixed tests
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] fixed coding style
  A......... [ZBXNEXT-6167,ZBXNEXT-6168] fixed 'extend' option usage in request sub-objects
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