View source for Minutes from 2020-09-28

Attendees: [[User:Sranganath|Sunku]], Barbara K, Borja, Dago, Elene M, Florian, Jack, Nikolay T, Pawel Z, Svetlana S, Z, Rafal, Hari TG, Thomas, Susan Coombs, Jack, Jabir, Maick, [[User:Octo|Octo]]


== Distribution metrics - Presentation from Google interns ==
* Presented by Barbara K, Elene M and Svetlana S
* Presentation to be updated soon
* Presentation recording to be uploaded
* What is the impact on other read plugins
** Ping used to calculate avg & std deviation, it was updated to include distribution metrics to find latency
** Classical read plugins for 1 sec, distribution metrics are for aggregation -> req latency response latency can be found out
** TODO: Everything that ingests metrics - network, exec, etc., plugin, all bindings - java plugin, python plugin
** TODO: Add support to write plugins, into daemon 
* Reference is available in csv plugin, its not necessarily that complex
** Support distributions natively
** Break the 1 distribution metric into 1 metric per bucket, ex. Write_prometheus plugin as it produces 1 line per metric
** Calculate percentile -> treat distribution metric as a scalar metric
* Impact of distribution metrics on cache
** Fixed bug
* Can we configure or are there any settings of buckets
** Option available for curl for boundaries of buckets and number of buckets
** Default is 100
* Looking to get this merged into 6.0 branch
* Thanks to interns for their contributions in a very short time

== Collectd 6.0 ==
* Merged main branch into 6.0 branch
* Created bugs for plugins to be ported, based on info gathered in spreadsheet
* With write_callback there is a line for updating the data structure
* Many plugins fall in the cracks
* CI needs to be updated too
* Guide is to be updated: https://collectd.org/wiki/index.php/V5_to_v6_migration_guide 
** Workflow, example code (CPU plugin or memory plugin)
** Florian will update it
* How long will 5.x be supported -> 
** 4.x was supported for many years (4-5), officially declared unsupported when it dropped out off debian stable
** Exponential back off, support this long time meaning security fixes
* New plugins for 5.x after 6.0 release, choices are:
** Build plugins from out of tree, separate repo
** Separate core plugins and rest of the plugins which would help core plugins
** This would require changes to configure file to help build faster for core plugins vs. others