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[infra][qa] multiline tracebacks not being indexed anymore


We used to be able to query for things like this:

message:"in reserve_block_device_name" AND message:"MessagingTimeout" 
AND tags:"screen-n-api.txt"

to fingerprint a traceback in logstash like this [1] but that no longer 
works. The multiline logstash filter is at [2] but doesn't seem to be 
getting applied anymore.

I asked about this in -infra today and fungi said:

"(4:44:00 PM) fungi: mriedem: i suspect that coincided with switching 
away from osla, we may need some means of parsing tracebacks out of logs 
in the indexer"

I don't know what that means (what's osla? is [2] no longer used?) but 
if someone could point me at some things to look at I could see if I can 
generate a fix.

[1] 
https://zuul.opendev.org/t/openstack/build/ef0196fe84804b44ac106d011c8c29ea/log/controller/logs/screen-n-api.txt.gz?severity=4#31403
[2] 
https://opendev.org/openstack/logstash-filters/src/branch/master/filters/openstack-filters.conf

-- 

Thanks,

Matt