But the following 3 lines should be appended to a file first, then next
time override the old content. But how to make the old content be overried
by previous ones?
print (" # HELP ldap_query_success LDAP query command",
file=open("/var/log/node_exporter/filecollector/ldap_query.prom", "a+"))
print (" # TYPE ldap_query_success gauge",
file=open("/var/log/node_exporter/filecollector/ldap_query.prom", "a+"))
print
('ldap_query_success'+'{'+'ldap_uri'+'='+service+','+'ldap_search_base'+'='+ldap_search_base+','+'}
'+str(query_check),
file=open("/var/log/node_exporter/filecollector/ldap_query.prom", "a+"))
On Monday, August 8, 2022 at 4:43:00 PM UTC+8 Stuart Clark wrote:
> On 2022-08-08 09:14, nina guo wrote:
> > Hi,
> >
> > I used the following way to output the metrics and values to a file,
> > and let node exporter to scrape it.
> >
> > I have a question here, how to let the next metrics value overide the
> > previous'?
> >
> > I checked .prom file, there are some metrics with same labels and same
> > values of labels but different value of the metrics. It is not
> > correct. The next value of the metrics should override the previous
> > old value. But how to implement this?
> >
> > print (" # HELP ldap_query_success LDAP query command",
> > file=open("/var/log/node_exporter/filecollector/ldap_query.prom",
> > "a+"))
> > print (" # TYPE ldap_query_success gauge",
> > file=open("/var/log/node_exporter/filecollector/ldap_query.prom",
> > "a+"))
> > print
> >
> ('ldap_query_success'+'{'+'ldap_uri'+'='+service+','+'ldap_search_base'+'='+ldap_search_base+','+'}
> > '+str(query_check),
> > file=open("/var/log/node_exporter/filecollector/ldap_query.prom",
> > "a+"))
> >
>
> You shouldn't be appending to an existing file, but instead replacing
> the file contents each time you do an update.
>
> Depending on the tooling used it is often better to create a new file
> with a random non *.prom filename and then rename it into the correct
> name - renames are generally atomic whereas file updates often aren't,
> meaning if you modify the file directly you could end up reading part
> finished data.
>
> --
> Stuart Clark
>
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