add gauge `redis_used_memory_percent`? about redis_exporter

[oliver006]

Interesting, let me look into that.

[oliver006]

@iwinux I pushed up commit e4cf9c9 that adds a gauge for redis_config_maxmemory so you can create a metric that uses used_memory and maxmemory to calculate usage percentage.
Let me know if that works for you.

[iwinux]

Thanks :)

I will try this out later and reply back soon.

[iwinux]

Hi,

Sorry for the late reply.

CONFIG GET maxmemory would not work as expected, because command CONFIG of our Redis instances are renamed with secret prefixes (to prevent mis-operation).

[Cas-pian]

Seems the maxmemory metric is missing from the newest version? The commit is not included?

[oliver006]

Ah, interesting. Looks like this got removed in April 2017 via #64
and now the metric is available via redis_memory_max_bytes (but only Redis versions that expose that info via CONFIG).
There's an open issue for this here: #82

Let me see if I can find some time over the next few days/weeks to bring back support for the config_ metrics.

[Cas-pian]

En, seems AWS INFO GET doesnot have maxmemory , but for common redis it works. Seems it's better to retrive the data in different way?