Thank you very much for your detailed guidance Michael. I will continue to 
investigate.

Many thanks for your continuous help Brian.

On Thursday, July 28, 2022 at 4:51:32 PM UTC+8 Michael Ströder wrote:

> On 7/28/22 05:56, nina guo wrote:
> > I want to compare the value of contextCSN from each ldap server.
>
> You seem to be using OpenLDAP.
>
> Note that contextCSN values have to be compared pair-wise distinguished 
> by serverID.
>
> The OpenMetrics output of my slapdcheck [1] is still not really nice 
> because it's mainly a compat wrapper around the legacy monitoring data. 
> But you can query the metrics and it already does the pair-wise 
> contextCSN comparison.
>
> I usually invoke slapdcheck as systemd one-shot service [2] triggered by 
> a systemd timer unit [3] and let it write the output to a file to be 
> collected by node-exporter's text-file collector. (The caveat is that 
> the metrics time is not the same like the collect time.)
>
> BTW: I find it also useful to let mtail extract some other metrics from 
> OpenLDAP stats log level messages [4]. Beware the example adds client IP 
> addresses to labels which can lead to time-series explosion if you have 
> many LDAP clients from different IP addresses. Adapt it to your needs.
>
> [1] https://code.stroeder.com/ldap/slapdcheck
>
> [2] 
>
> https://code.stroeder.com/AE-DIR/ansible-ae-dir-server/src/branch/main/templates/systemd/slapdcheck.service.j2
>
> [3] 
>
> https://code.stroeder.com/AE-DIR/ansible-ae-dir-server/src/branch/main/templates/systemd/slapdcheck.timer.j2
>
> [4] 
>
> https://code.stroeder.com/AE-DIR/ansible-ae-dir-server/src/branch/main/templates/mtail/ae-slapd.mtail.j2
>
> Ciao, Michael.
>

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