Re: Use telegraf/influx to detect problems is very difficult

[Miroslav Kalina <miroslav.kalina@xxxxxxxxxxxx>]

    As I mentioned yesterday here, there is an issue with current scheme
    of metrics.
    
    With current scheme you cannot do simple math like
    
    > SELECT num_osd - num_osd_up FROM "ceph_cluster_stats"
    
    Instead you will need query like
    
    > SELECT (SELECT last("value") FROM "ceph_cluster_stats" WHERE
    "type_instance" = 'num_osd') - (SELECT last("value") FROM
    "ceph_cluster_stats" WHERE "type_instance" = 'num_osd_up')
    
    which is not supported by InfluxDB.
    
    I know this type of queries works perfectly in prometheus or SQL
    world, but AFAIK you unfortunately cannot easily combine multiple
    series in InfluxDB.
    
    
    
    To Mario's issue with alerting - maybe you can try to use kapacitor
    for alerting purposes. I have no direct experiences with it, but it
    should be easily controlled via chronograf and could solve your
    issue.
    
    M.

On 12/11/19 4:58 AM, Konstantin Shalygin wrote:

But it is very difficult/complicated to make simple queries because, for
example I have osd up and osd total but not osd down metric.

To determine how much osds down you don't need special metric, because you already

have osd_up and osd_in metrics. Just use math.

k

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Miroslav Kalina
Systems developement specialist

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