| # OnCallVal taxonomy |
|
|
| Generated from `src/oncallval/faults.py`. Tier = f(weight): |
| medium 2–4, hard 5–7, severe 8+. |
| weight = Σ fault base weights + 3 × (extra faults) + 1 × decoys. |
|
|
| ## Fault families |
|
|
| | Family | Base weight | Signature | Minimal fix | Health predicate | |
| |---|---:|---|---|---| |
| | `bad_deploy` | 3 | error spike + panic logs aligned with the newest deploy | `rollback` | current version ≠ buggy version | |
| | `memory_leak` | 4 | mem_pct climbs since deploy, OOMKilled events, restart churn | `rollback` | current version ≠ buggy version | |
| | `config_drift` | 3 | config ≠ runbook recommended; family-specific error logs | `set_config` to recommended | config[key] == recommended | |
| | `dependency_outage` | 4 | caller logs `connection refused` to the dead endpoint; external probes down | fail caller's endpoint key to the backup | endpoint ≠ dead endpoint | |
| | `capacity_shortfall` | 3 | cpu pegged, 503 saturated logs, replicas < ceil(rps / runbook rps_per_replica) | `scale` to required | replicas ≥ required | |
| | `secret_expiry` | 3 | x509 expired logs; cert `expires_at_min` negative | `rotate_secret` | rotated_at is set | |
| | `poison_message` | 4 | worker crash loop naming one message id; queue shows huge redelivery count | `purge_message` | poison message absent | |
| | `host_failure` | 4 | one host unhealthy; every service with replicas there degrades; per-host error 55% | `drain_host` | primary service has 0 replicas on the host | |
| |
| ## Decoys (weight 1 each) |
| |
| | Decoy | Effect | |
| |---|---| |
| | `irrelevant_deploy` | an innocent deploy on a healthy service, timestamp-correlated with the incident | |
| | `known_issue` | periodic WARN logs marked as a tracked known issue | |
| | `cosmetic_slow` | p99 elevated but within SLO on an unrelated service | |
|
|
| ## Actions |
|
|
| Reads (0.2 sim-minutes, 1 budget step): `list_services`, `get_service`, |
| `get_metrics`, `get_deploys`, `get_runbook`, `query_logs`, `peek_queue`. |
|
|
| Mutations: `restart` (+2m), `rollback` (+5m), `set_config` (+1m), |
| `scale` (+3m), `rotate_secret` (+2m), `purge_message` (+1m), |
| `drain_host` (+6m), `submit_report` (ends the episode). |
|
|
| Budgets: medium 26, hard 32, severe 40 actions. |
|
|
| ## Blast radius |
|
|
| `host_failure` degrades **every** managed service with replicas on the dead |
| host, not only the paged one. `dependency_outage` pages the caller, one hop |
| away from the true fault. Severe episodes combine two disjoint faults, both of |
| which must be inactive for `mitigated`. |
|
|
