Hi all, For those who are interested, I've added notes on how the exemplar storage might handle tail based sampling of traces. These notes are based on discussions I've had with a few people involved in/working on tracing systems.
As usual, please let me know if you have any feedback. The current exemplar storage PR is here: https://github.com/prometheus/prometheus/pull/6635 In the current state, building Prometheus from that branch will allow you to scrape, store, and query exemplars. Thanks, Callum. On Thu, Jan 9, 2020 at 3:39 PM Callum Styan <[email protected]> wrote: > Hi all, > > As many of you know we've been planning to add minimal in-memory storage > of exemplars within Prometheus for some time now. Some work has already > been done in this area; including the exposition of exemplars in the Python > client > <https://github.com/prometheus/client_python/search?q=exemplar&unscoped_q=exemplar>, > and parsing of the Open Metrics exemplar format > <https://github.com/prometheus/prometheus/pull/6292> by the > M3/Chronosphere folks, who also proposed a possible storage interface here > <https://github.com/prometheus/prometheus/pull/6309>. > > More recently some of us have been putting together a design doc for the > end to end exemplar experience within Prometheus; discussing what the query > flow for exemplars might look like from Grafana itself, what the storage > interface (external and internal) API might look like, and how the internal > storage could be implemented. > > Some of you have also seen the experimental implementation PR > <https://github.com/prometheus/prometheus/pull/6574> I opened a few days > ago. From the comments there it sounds like there may be exemplar querying > use cases that haven't been discussed yet, which I would ask you to make > note of in the design doc. > > With all that said, here's the design doc > <https://docs.google.com/document/d/1ymZlc9yuTj8GvZyKz1r3KDRrhaOjZ1W1qZVW_5Gj7gA/edit?usp=sharing>. > Note that an implementation has not been finalized yet. > > Thanks, > Callum. > -- You received this message because you are subscribed to the Google Groups "Prometheus Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-developers/CAN2d5OT%2BJi4DB4fupTyjsgRa_T%2ByZiiVfG-FuEJDRV%3DWXDJDvg%40mail.gmail.com.
