nginx-custom-counters-module version 4.4

• Added new predefined counters $cnt_start_time and $cnt_start_time_reload.
• Separated JSON parse and structure errors.

nginx-custom-counters-module version 4.3

• Using logarithmic inclusive upper bound search algorithm when getting the range index in histograms.
• Log messages wrongly tagged as alert were re-tagged as notice or error.

nginx-custom-counters-module version 4.2

• Implemented histogram operation reuse to enable repeated re-declarations of histograms in a single counter set.
• Various bug fixes and improvements in histograms implementation.

nginx-custom-counters-module version 4.1

Added 7 predefined counters from the Nginx stub status module.

nginx-custom-counters-module version 4.0

• New features
  • Added new predefined counter variables $cnt_uptime and $cnt_uptime_reload to show seconds elapsed since Nginx master start and reload.
  • Added new directive map_to_range_index to facilitate working with contiguously distributed histograms such as request durations and sent bytes.
  • Added new predefined variable $cnt_histograms to expose internal layouts of histograms.
• Improvements
  • Internal code reorganization.
• See also
  • Haskell module NgxExport.Tools.Prometheus to convert custom counters from this module to Prometheus metrics.

nginx-custom-counters-module version 3.2

Bugfix: histograms were not properly initialized which could lead to segfaults when using them.

nginx-custom-counters-module version 3.1

Do not enable building persistent counters by default.

nginx-custom-counters-module version 3.0

• Implemented counter operation undo to disable changing the counter in the scope where this operation is declared.
• Implemented histograms as a convenient way of dealing with a set of normal counters associated with an arbitrary range.

nginx-custom-counters-module version 2.2

More fixes and improvements in implementation of persistent counters.

• Now relative path in directive counters_persistent_storage means that the counters will be loaded and stored in the Nginx prefix directory.
• Always set correct permissions for the backup storage file such that worker processes can write into it.
• Do not try to reopen inexistent main storage file on backup copy failure.
• Skip parsing empty persistent storages.

nginx-custom-counters-module version 2.1

Various fixes and improvements in implementation of the persistent counters backup.

• Stricter check for corruption of the backup file (JSMN_STRICT is on).
• Check if to write the backup file only in a single phase of a request (namely, in the late log phase).
• Ensure that the backup file gets always checked after copying into the main storage file.
• Other less significant improvements and fixes.