On 5 Apr 2019, at 10:22, Stephan Erb wrote:

> Hi Florian,
>
> this is a great idea. We actually thought about implementing something
> like this but never had the chance yet.
>
> We are running Nginx in front of our Devpi instances and therefore
> already have sufficient Prometheus metrics coverage of HTTP requests,
> request latencies, etc.  What would still be helpful:
>
> * The master serial, current serial, and processed event serial. This
> would allow us to easily alert on lagging replicas.
> * The number of keyfs cache hits and cache misses so that we know when
> to tune the keyfs-cache-size

I thought of the above myself.

> * Some internal counters to figure out when and how often we are
> running into expired mirror caches.

Could you elaborate on this?

All the above would be possible solely from a plugin, so I think I will
go that route first.

Regards,
Florian Schulze
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