Moving this to prometheus-users where it fits better.
Try using the "unless" operator to compare against a metric that is present
for all instances that should have this mountpoint. Assuming that is the
case for all targets under this job:
up{job=XX"} unless on(instance)
node_filesystem_readonly{fstype="nfs2",mountpoint="/NFS2"}
(or something like that) The idea is that any instance of this job is
suspect, unless it has the mount point specific metric.
/MR
On Sun, Feb 28, 2021, 10:56 s.saurab...@gmail.com <
s.saurabhjain...@gmail.com> wrote:
>
> Hi Everyone,
>
> I have specific requirement from the client that prometheus should
> generate alert in case any mount point on the server goes missing.
>
> For Eg: If server has 3 mount points like /data1 /NFS1 /NFS2 and if by any
> reason ,/NFS2 gets delinked from the server in that case prometheus should
> generate alert.
>
> When I tried with below query,it is working fine(as this metric goes
> missing when /NFS2 got delinked from the server)
>
> absent(node_filesystem_readonly{device="XX:/NFS2",fstype="nfs2",hostname="EAST_WB_XX",instance="XX:9100",job="XX",mountpoint="/NFS2"})
> == 1
>
> However there are 800 servers which are required to get monitor therefore
> it is not possible to add 800 rules for each IP in the rules.yml.
>
> When I add below rule,it didn't generate the missing alert.
>
> absent(node_filesystem_readonly{mountpoint="/NFS2"}) == 1
>
> Please advice if we can achieve this with some tweaking in the query so
> that it can be generic for all servers.
>
> Looking forward for your response.
>
> Thanks,
> Saurabh
>
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