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The dataset generation failed
Error code:   DatasetGenerationError
Exception:    CastError
Message:      Couldn't cast
model: string
version: string
via: string
id: string
gold_action: string
gold_page: bool
family: string
trap: bool
trap_kind: string
severityText: string
page_now: bool
page_now_probability: double
data_at_risk: bool
data_at_risk_probability: double
urgency: string
trigger: bool
reason: string
wall_ms: double
input_tokens: int64
output_tokens: int64
attempts: int64
to
{'model': Value('string'), 'via': Value('string'), 'id': Value('string'), 'gold_action': Value('string'), 'gold_page': Value('bool'), 'family': Value('string'), 'trap': Value('bool'), 'trap_kind': Value('string'), 'severityText': Value('string'), 'page_now': Value('bool'), 'page_now_probability': Value('float64'), 'urgency': Value('string'), 'trigger': Value('bool'), 'reason': Value('string'), 'wall_ms': Value('float64'), 'input_tokens': Value('int64'), 'output_tokens': Value('int64'), 'attempts': Value('int64')}
because column names don't match
Traceback:    Traceback (most recent call last):
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1827, in _prepare_split_single
                  for key, table in generator:
                                    ^^^^^^^^^
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 613, in wrapped
                  for item in generator(*args, **kwargs):
                              ~~~~~~~~~^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 343, in _generate_tables
                  self._cast_table(pa_table, json_field_paths=json_field_paths),
                  ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 132, in _cast_table
                  pa_table = table_cast(pa_table, self.info.features.arrow_schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2378, in table_cast
                  return cast_table_to_schema(table, schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2306, in cast_table_to_schema
                  raise CastError(
                  ...<3 lines>...
                  )
              datasets.table.CastError: Couldn't cast
              model: string
              version: string
              via: string
              id: string
              gold_action: string
              gold_page: bool
              family: string
              trap: bool
              trap_kind: string
              severityText: string
              page_now: bool
              page_now_probability: double
              data_at_risk: bool
              data_at_risk_probability: double
              urgency: string
              trigger: bool
              reason: string
              wall_ms: double
              input_tokens: int64
              output_tokens: int64
              attempts: int64
              to
              {'model': Value('string'), 'via': Value('string'), 'id': Value('string'), 'gold_action': Value('string'), 'gold_page': Value('bool'), 'family': Value('string'), 'trap': Value('bool'), 'trap_kind': Value('string'), 'severityText': Value('string'), 'page_now': Value('bool'), 'page_now_probability': Value('float64'), 'urgency': Value('string'), 'trigger': Value('bool'), 'reason': Value('string'), 'wall_ms': Value('float64'), 'input_tokens': Value('int64'), 'output_tokens': Value('int64'), 'attempts': Value('int64')}
              because column names don't match
              
              The above exception was the direct cause of the following exception:
              
              Traceback (most recent call last):
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1369, in compute_config_parquet_and_info_response
                  parquet_operations, partial, estimated_dataset_info = stream_convert_to_parquet(
                                                                        ~~~~~~~~~~~~~~~~~~~~~~~~~^
                      builder, max_dataset_size_bytes=max_dataset_size_bytes
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                  )
                  ^
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 948, in stream_convert_to_parquet
                  builder._prepare_split(split_generator=splits_generators[split], file_format="parquet")
                  ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1694, in _prepare_split
                  for job_id, done, content in self._prepare_split_single(
                                               ~~~~~~~~~~~~~~~~~~~~~~~~~~^
                      gen_kwargs=gen_kwargs, job_id=job_id, **_prepare_split_args
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                  ):
                  ^
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1880, in _prepare_split_single
                  raise DatasetGenerationError("An error occurred while generating the dataset") from e
              datasets.exceptions.DatasetGenerationError: An error occurred while generating the dataset

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model
string
via
string
id
string
gold_action
string
gold_page
bool
family
string
trap
bool
trap_kind
string
severityText
string
page_now
bool
page_now_probability
float64
urgency
string
trigger
bool
reason
string
wall_ms
float64
input_tokens
int64
output_tokens
int64
attempts
int64
typesafe-ai/jev
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56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0078
page
true
disk_full_writes_failing
false
null
ERROR
false
0.95
page
true
model
1,137.907291
609
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0079
page
true
credential_stuffing
false
null
WARN
false
0.92
page
true
model
1,405.55125
594
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0080
page
true
crash_loop_user_impact
false
null
ERROR
false
0.97
page
true
model
1,668.6245
596
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0081
page
true
checkout_slo_burn
false
null
WARN
false
0.97
page
true
model
1,927.720875
615
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0082
page
true
replica_lag_data_risk
true
info_should_page
INFO
false
0.28
ticket
false
model
1,784.433584
583
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0083
page
true
checkout_slo_burn
false
null
WARN
false
0.97
page
true
model
1,636.526166
615
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0084
page
true
replica_lag_data_risk
true
info_should_page
INFO
false
0.3
ticket
false
model
1,527.053875
587
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0085
page
true
queue_backup_checkout
false
null
WARN
false
0.95
page
true
model
1,456.037583
590
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0086
page
true
replica_lag_data_risk
true
info_should_page
INFO
false
0.27
ticket
false
model
1,620.913417
587
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0087
page
true
tls_hours_left_serving
false
null
WARN
false
0.48
page
true
model
1,520.181042
596
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0088
page
true
checkout_slo_burn
false
null
WARN
false
0.97
page
true
model
1,272.62325
615
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0089
page
true
credential_stuffing
false
null
WARN
false
0.91
page
true
model
1,113.710625
594
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0090
page
true
revoked_key_used
false
null
ERROR
false
0.9
page
true
model
933.9245
605
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0091
page
true
credential_stuffing
false
null
WARN
false
0.91
page
true
model
1,002.149417
594
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0092
page
true
credential_stuffing
false
null
WARN
false
0.92
page
true
model
1,057.809417
593
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0093
page
true
checksum_corruption
false
null
ERROR
false
0.86
page
true
model
1,263.185959
602
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0094
page
true
checksum_corruption
false
null
ERROR
false
0.87
page
true
model
1,241.056166
602
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0095
page
true
tls_hours_left_serving
false
null
WARN
false
0.52
page
true
model
1,148.882291
596
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0096
page
true
disk_full_writes_failing
false
null
ERROR
false
0.96
page
true
model
1,230.78175
604
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0097
page
true
credential_stuffing
false
null
WARN
false
0.92
page
true
model
1,082.833542
593
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0098
page
true
replica_lag_data_risk
true
info_should_page
INFO
false
0.28
ticket
false
model
1,099.742541
588
56
1
typesafe-ai/jev
vercel-ai-gateway
pager:0099
page
true
credential_stuffing
false
null
WARN
false
0.92
page
true
model
1,100.030709
593
56
1
End of preview.

Jev vs Luna as a PagerDuty trigger

Synthetic checkout/payments log stream with gold labels from PagerDuty alerting principles: page only if a human must act now. TypeSafe’s Jev (typesafe-ai/jev) and GPT-5.6 Luna (openai/gpt-5.6-luna) both ran on Vercel AI Gateway. There is no ERROR auto-page.

This is not production traffic and not the Loghub junk-filter benchmark.

Headline (seed 20260917, n=3000)

Recommended trigger: Jev v3 page_now.probability >= 0.50 (one boolean; not discrete urgency==page).

Page recall Page precision False pages INFO replica-lag paged Est. USD
Jev v1 urgency==page 0.886 1.000 0 0/57 $0.072
Jev v1 p≥0.22 (same calls) 1.000 1.000 0 57/57 $0
Jev v2 urgency==page 1.000 0.726 189 57/57 $0.087
Jev v2 p≥0.50 1.000 1.000 0 57/57 $0.087
Jev v3 p≥0.50 1.000 1.000 0 57/57 $0.062
Luna 0.962 1.000 0 46/57 $0.320
ERROR severity 0.492 0.330 500 0/57 0

Luna content-filtered 130/155 injection-style user searches (Azure policy). Those rows are in data/luna.jsonl as reason=unavailable and are excluded from rates. Jev classified all 155 as ignore.

Confirm dollar figures on the Vercel AI Gateway dashboard. Prices were fetched at run time: Jev $0.042/M input, Luna $0.20 / $1.20.

Recall vs precision

Traps

Families

Spend

Files

Path
metrics.json v1 numbers
metrics_v2.json v1 vs calibrated vs v2 vs Luna (recommended page_now.p≥0.50)
metrics_v3.json single-question Jev (same trigger, fewer tokens)
data/stream.jsonl Labeled logs (gold_action, gold_page, family, trap)
data/jev.jsonl Jev v1 decisions
data/jev_v2.jsonl Jev v2 (page_now + data_at_risk + urgency)
data/jev_v3.jsonl Jev v3 (page_now only)
data/luna.jsonl Luna decisions
charts/*.png Charts

Reproduce

export AI_GATEWAY_API_KEY=...
node benchmarks/pager/generate.mjs
node benchmarks/pager/run.mjs
node benchmarks/pager/run-jev-v2.mjs
node benchmarks/pager/run-jev-v3.mjs
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