Zabbix

..F.....S. [ZBXNEXT-6879] implemented new history functions "rate", "bucket_rate_foreach" and "bucket_percentile" and math function "histogram_quantile"

* commit '7a908787414ad1e2bbbe80b080d0254dd84d5508': (36 commits)
  A......... [ZBXNEXT-6879,ZBXNEXT-6880] removed useless code; updated PHPDoc
  ..F....... [ZBXNEXT-6879] fixed syntax rules for "bucket_percentile" function
  .......PS. [ZBXNEXT-6879] fixed negative rate() value
  .......... [ZBXNEXT-6879] fixed selenium test
  ..F....... [ZBXNEXT-6879] fixed coding style
  ..F....... [ZBXNEXT-6879] updated unit tests for expression validator
  ..F....... [ZBXNEXT-6879] fixed expression function descriptors and validators
  .......PS. [ZBXNEXT-6879] fixed condition of percentile
  .......... [ZBXNEXT-6879] added cmocka tests
  .......PS. [ZBXNEXT-6879] minor refactoring
  .......PS. [ZBXNEXT-6879] fixed condition where +Inf count is zero
  .......PS. [ZBXNEXT-6879] fixed multiple PR notes
  .......... [ZBXNEXT-6879] added cmocka tests
  .......PS. [ZBXNEXT-6879] added histogram_quantile() cmocka tests and fix
  .......PS. [ZBXNEXT-6879] added rate() cmocka tests
  .......PS. [ZBXNEXT-6879] improved error message about the zero for +inf bucket
  .......PS. [ZBXNEXT-6879] removed HVT macro
  .......PS. [ZBXNEXT-6879] removed redundant macro
  .......PS. [ZBXNEXT-6879] removed expression_eval_bucket_rate() warnings
  .......PS. [ZBXNEXT-6879] removed redundant space
  ...