Find the failures in a log

Yes/no per log line: keep only the lines an on-call engineer would act on.

Input

app.log:

2026-09-27 10:03:12 INFO  request served /checkout 200 in 84ms
2026-09-27 10:03:25 WARN  slow query 1.2s on orders_by_user
2026-09-27 10:03:40 ERROR payment gateway timeout after 30s (order 4021)
2026-09-27 10:03:51 INFO  cache warmed 1200 keys
2026-09-27 10:04:02 FATAL db connection refused: too many clients
2026-09-27 10:04:10 INFO  healthcheck ok

Call the local server

curl -s localhost:21118/v1/systemone -d '{"state": "2026-09-27 10:03:12 INFO  request served /checkout 200 in 84ms", "questions": {"act": {"type": "noul", "instructions": "Is this line an error or failure an on-call engineer would act on?"}}}'

Real answer for the first input (openjevx v0.4.0 8-bit model, CPU):

{"answers":{"act":{"action":{"act_probability":1},"answer_confidence":0.8134,"confidence":0.8134,"noul":0.1866,"probabilities":{"false":0.8134,"true":0.1866},"type":"noul"}},"model":"openjevx","usage":{"input_tokens":64,"output_tokens":0}}

Same thing with jevx

jevx filter --profile openjevx --no-context "Is this line an error or failure an on-call engineer would act on?" < app.log

Real output:

2026-09-27 10:03:40 ERROR payment gateway timeout after 30s (order 4021)
2026-09-27 10:04:02 FATAL db connection refused: too many clients

Scores for every line

jevx ask --profile openjevx --no-context --lines app.log --noul act="Is this line an error or failure an on-call engineer would act on?"

Real output:

VERDICT  P     INPUT
no       0.19  2026-09-27 10:03:12 INFO  request served /checkout 200 in 84ms
unsure   0.74  2026-09-27 10:03:25 WARN  slow query 1.2s on orders_by_user
yes      0.84  2026-09-27 10:03:40 ERROR payment gateway timeout after 30s (order 4021)
no       0.12  2026-09-27 10:03:51 INFO  cache warmed 1200 keys
yes      0.84  2026-09-27 10:04:02 FATAL db connection refused: too many clients
no       0.17  2026-09-27 10:04:10 INFO  healthcheck ok

The table output needs jevx v0.11.0 or newer.

What to do with the answer

Open the code behind the kept lines; skip the rest. Read noul as the probability of yes: jevx's defaults are yes at 0.8 or above and no at 0.2 or below; in between, ask a narrower question or check it yourself.

How the local model did

Right on the clear cases: the ERROR and FATAL lines are yes (0.84) and jevx filter keeps exactly those two; the INFO lines are no (0.12-0.19). The slow-query WARN comes back unsure (0.74), which hosted Jev leaves out; read it yourself if you want it.