sevclassifier-jev-style-1.5b

Local System One model for incident severity classification. JEV-compatible typed decisions, no API key required.

Drop-in local alternative to TypeSafe Jev for incident management pipelines. Returns SEV1-4, escalation flag, and blast radius — swap the endpoint, keep the agent.

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Overview

sevclassifier-jev-style-1.5b is a fine-tuned Qwen2.5-1.5B-Instruct that produces typed incident severity classifications — matching the output contract of TypeSafe System One / Jev for incident triage pipelines.

It outputs a single JSON object per incident:

{
  "severity": "SEV1 | SEV2 | SEV3 | SEV4",
  "rationale": "<one sentence>",
  "escalate": true,
  "page_oncall": false,
  "affected_blast_radius": "<scope description>"
}

Feed it SIEM alerts, PagerDuty payloads, or Datadog monitor events. Get a typed decision the agent acts on immediately — page oncall for SEV1/2, create ticket for SEV3, suppress SEV4 noise.

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Why local?

Incident alerts contain hostnames, IPs, service names, and error messages — the exact fingerprint of your infrastructure. Run the classifier on-prem.

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Quickstart

from transformers import AutoModelForCausalLM, AutoTokenizer
import torch, json, re

tok = AutoTokenizer.from_pretrained("enterprise-ai-lab/sevclassifier-jev-style-1.5b")
model = AutoModelForCausalLM.from_pretrained(
    "enterprise-ai-lab/sevclassifier-jev-style-1.5b", dtype=torch.float32
).eval()

SYS = (
    "You are an incident severity classification assistant. For each incident report output ONE "
    "JSON object with keys: severity (SEV1|SEV2|SEV3|SEV4), rationale (one sentence), "
    "escalate (boolean), page_oncall (boolean), affected_blast_radius (string). "
    "SEV1=critical outage/breach, SEV2=major impact, SEV3=minor/degraded, SEV4=informational/noise. "
    "Output only the JSON."
)

def classify_incident(title, details):
    content = f"Incident: {title}\n\nDetails: {details}"
    msgs = [{"role": "system", "content": SYS}, {"role": "user", "content": content}]
    prompt = tok.apply_chat_template(msgs, tokenize=False, add_generation_prompt=True)
    ids = tok(prompt, return_tensors="pt")
    with torch.no_grad():
        out = model.generate(**ids, max_new_tokens=150, do_sample=False,
                             pad_token_id=tok.eos_token_id)
    text = tok.decode(out[0][ids["input_ids"].shape[1]:], skip_special_tokens=True)
    m = re.search(r"\{.*\}", text, re.DOTALL)
    return json.loads(m.group(0)) if m else {}

result = classify_incident(
    "Production database unreachable",
    "Primary RDS instance not responding. All pods returning 500. 12k users affected."
)
# {"severity": "SEV1", "rationale": "Full production outage.", "escalate": true, "page_oncall": true, "affected_blast_radius": "All production traffic"}

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PagerDuty / OpsGenie integration

Wire it as an OpenAI-compatible endpoint and drop it into your existing alert routing agent:

# Before (Jev):
llm = ChatOpenAI(base_url="https://api.typesafe.ai/v1", api_key=JEV_KEY, model="jev-latest")
# After (SevClassifier local):
llm = ChatOpenAI(base_url="http://localhost:8000/v1", api_key="not-needed", model="sevclassifier-jev-style-1.5b")

Routing pattern:

verdict = classify_incident(title, details)
if verdict["severity"] in ("SEV1", "SEV2") and verdict["page_oncall"]:
    pagerduty.trigger(title, urgency="high")
elif verdict["severity"] == "SEV3":
    jira.create_ticket(title, priority="medium")
# SEV4: suppress, log only

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Training

Fine-tuned with LoRA (r=16, alpha=32) on a curated incident corpus:

• 78,500 incidents from SRE runbooks, post-mortems, and SIEM alert exports (2019-2024)
• Ground truth: retrospective human severity labels from SRE teams
• Covers: infrastructure outages, security incidents, data pipeline failures, user-impacting bugs
• Held-out validation: 4,200 incidents stratified by severity
• Training: 12 epochs, AdamW lr=2e-4, MPS/CUDA

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Benchmarks

SevBench (holdout, n=4,200)

SEV1 Recall (no missed critical incidents)

High SEV1 recall is the critical metric: a missed SEV1 is an undetected outage. False escalations are expensive but recoverable.

Latency (Apple M2, 16GB, batch=1)

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Intended use

• Alert fatigue reduction (auto-suppress SEV4 noise)
• Automatic PagerDuty escalation for SEV1/2
• Incident ticket creation and prioritization
• SOC triage assist for security incidents

Limitations

• Trained on English incident descriptions
• Severity scales vary by org — fine-tune on your own runbook for best results
• Not a replacement for domain-specific monitoring thresholds

License

Apache 2.0. Base model (Qwen2.5-1.5B-Instruct) is subject to its own Qwen license.

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