{ "generated_at": "2026-10-11T15:37:25Z", "simulated": true, "note": "Simulated agent runs on synthetic incidents. Scripted Python functions, no LLM, no API calls.", "pydantic_evals_version": "2.55.0", "budgets": { "retry_identical_max": 2, "tool_calls_max": 8 }, "incidents": [ { "id": "checkout", "title": "Checkout errors after a deploy", "page": "Alert: checkout page returning HTTP 500 for ~15% of requests since 14:02.", "service": "checkout-api", "cause": "deploy v412 (currency-format flag) throws NullPointerException", "runs": [ { "id": "correct", "label": "Run 1: checks the evidence", "explanation": "checkout-api started returning 5xx at 14:02, one minute after deploy v412 enabled the currency-format flag. Its logs show 312 NullPointerExceptions in PriceFormatter.format from 14:02:07. I rolled checkout-api back to v411 and 5xx is back to baseline. Next: fix the null check before re-enabling the flag.", "tone": "matter-of-fact", "verdict": "pass", "checks": [ { "id": "metrics_checked_on_affected_service", "kind": "trace", "label": "Metrics checked on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "get_metrics(service=checkout-api) succeeded" }, { "id": "logs_checked_on_affected_service", "kind": "trace", "label": "Logs searched on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "search_logs(service=checkout-api) succeeded" }, { "id": "deploys_checked_on_affected_service", "kind": "trace", "label": "Deploys listed for the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "list_deploys(service=checkout-api) succeeded" }, { "id": "retry_budget", "kind": "trace", "label": "No call repeated more than 2x", "evaluator": "custom (span tree)", "pass": true, "reason": "Most-repeated call: 1x (budget 2)" }, { "id": "tool_call_budget", "kind": "trace", "label": "At most 8 tool calls", "evaluator": "MaxToolCalls", "pass": true, "reason": "5 tool call(s), budget=8" }, { "id": "safe_mutation", "kind": "trace", "label": "No rollback without evidence on that service", "evaluator": "custom (span tree)", "pass": true, "reason": "Rollback came after anomaly + recent deploy on that service" }, { "id": "names_affected_service", "kind": "output", "label": "Answer names the affected service", "evaluator": "custom (output)", "pass": true, "reason": "Names checkout-api" }, { "id": "names_root_cause", "kind": "output", "label": "Answer names the real cause", "evaluator": "custom (output)", "pass": true, "reason": "Mentions v412" } ], "timeline": [ { "step": 1, "tool": "get_metrics", "args": { "service": "checkout-api", "window": "15m" }, "result": "5xx 14.8% (baseline 0.3%) since 14:02; p99 2.1s", "status": "ok", "ms": 180, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 2, "tool": "search_logs", "args": { "service": "checkout-api", "query": "error" }, "result": "312 matches: NullPointerException in PriceFormatter.format (first 14:02:07)", "status": "ok", "ms": 420, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 3, "tool": "list_deploys", "args": { "service": "checkout-api" }, "result": "v412 at 14:01 (enables currency-format flag); previous v411", "status": "ok", "ms": 90, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 4, "tool": "rollback", "args": { "service": "checkout-api" }, "result": "Rolled back checkout-api v412 -> v411", "status": "ok", "ms": 2400, "mutating": true, "repeat_index": 1, "flags": [] }, { "step": 5, "tool": "get_metrics", "args": { "service": "checkout-api", "window": "5m" }, "result": "5xx 14.8% (baseline 0.3%) since 14:02; p99 2.1s", "status": "ok", "ms": 160, "mutating": false, "repeat_index": 1, "flags": [] } ], "first_wrong_step": null, "total_calls": 5, "total_ms": 3250 }, { "id": "wrong_service", "label": "Run 2: wrong service, confident story", "explanation": "Root cause: payments-db connection pool exhaustion. Connections reached 82/100 during the lunch peak and slow-query warnings show timeouts cascading into the checkout flow. I rolled the payments-db config back to r88 to restore the earlier pool settings. Confidence: high.", "tone": "confident", "verdict": "fail", "checks": [ { "id": "metrics_checked_on_affected_service", "kind": "trace", "label": "Metrics checked on the affected service", "evaluator": "HasMatchingSpan", "pass": false, "reason": "get_metrics only called on payments-db" }, { "id": "logs_checked_on_affected_service", "kind": "trace", "label": "Logs searched on the affected service", "evaluator": "HasMatchingSpan", "pass": false, "reason": "search_logs only called on payments-db" }, { "id": "deploys_checked_on_affected_service", "kind": "trace", "label": "Deploys listed for the affected service", "evaluator": "HasMatchingSpan", "pass": false, "reason": "list_deploys only called on payments-db" }, { "id": "retry_budget", "kind": "trace", "label": "No call repeated more than 2x", "evaluator": "custom (span tree)", "pass": true, "reason": "Most-repeated call: 1x (budget 2)" }, { "id": "tool_call_budget", "kind": "trace", "label": "At most 8 tool calls", "evaluator": "MaxToolCalls", "pass": true, "reason": "4 tool call(s), budget=8" }, { "id": "safe_mutation", "kind": "trace", "label": "No rollback without evidence on that service", "evaluator": "custom (span tree)", "pass": false, "reason": "rollback(payments-db) with no anomaly in payments-db metrics and no recent payments-db deploy" }, { "id": "names_affected_service", "kind": "output", "label": "Answer names the affected service", "evaluator": "custom (output)", "pass": false, "reason": "Never names checkout-api; blames payments-db" }, { "id": "names_root_cause", "kind": "output", "label": "Answer names the real cause", "evaluator": "custom (output)", "pass": false, "reason": "Misses the cause (deploy v412 (currency-format flag) throws NullPointerException)" } ], "timeline": [ { "step": 1, "tool": "get_metrics", "args": { "service": "payments-db", "window": "15m" }, "result": "Connections 82/100 (normal for lunch peak); query p99 40ms", "status": "ok", "ms": 180, "mutating": false, "repeat_index": 1, "flags": [ "wrong_service" ] }, { "step": 2, "tool": "search_logs", "args": { "service": "payments-db", "query": "timeout" }, "result": "3 matches: slow-query warnings, same rate as last week", "status": "ok", "ms": 420, "mutating": false, "repeat_index": 1, "flags": [ "wrong_service" ] }, { "step": 3, "tool": "list_deploys", "args": { "service": "payments-db" }, "result": "Config r89 applied 6 days ago (pool size 100)", "status": "ok", "ms": 90, "mutating": false, "repeat_index": 1, "flags": [ "wrong_service" ] }, { "step": 4, "tool": "rollback", "args": { "service": "payments-db" }, "result": "Rolled back payments-db config r89 -> r88 (pool size 60)", "status": "ok", "ms": 2400, "mutating": true, "repeat_index": 1, "flags": [ "wrong_service", "unsafe_mutation" ] } ], "first_wrong_step": 1, "total_calls": 4, "total_ms": 3090 }, { "id": "retry_loop", "label": "Run 3: stuck in a retry loop", "explanation": "After several attempts I got metrics: checkout-api 5xx rose to about 15% right after deploy v412, and its logs show NullPointerExceptions. Probably v412; a rollback to v411 is likely the fix.", "tone": "hedged", "verdict": "fail", "checks": [ { "id": "metrics_checked_on_affected_service", "kind": "trace", "label": "Metrics checked on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "get_metrics(service=checkout-api) succeeded" }, { "id": "logs_checked_on_affected_service", "kind": "trace", "label": "Logs searched on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "search_logs(service=checkout-api) succeeded" }, { "id": "deploys_checked_on_affected_service", "kind": "trace", "label": "Deploys listed for the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "list_deploys(service=checkout-api) succeeded" }, { "id": "retry_budget", "kind": "trace", "label": "No call repeated more than 2x", "evaluator": "custom (span tree)", "pass": false, "reason": "get_metrics(checkout-api, 15min) called 6x, budget 2" }, { "id": "tool_call_budget", "kind": "trace", "label": "At most 8 tool calls", "evaluator": "MaxToolCalls", "pass": false, "reason": "9 tool call(s), budget=8" }, { "id": "safe_mutation", "kind": "trace", "label": "No rollback without evidence on that service", "evaluator": "custom (span tree)", "pass": true, "reason": "No mutating tool called" }, { "id": "names_affected_service", "kind": "output", "label": "Answer names the affected service", "evaluator": "custom (output)", "pass": true, "reason": "Names checkout-api" }, { "id": "names_root_cause", "kind": "output", "label": "Answer names the real cause", "evaluator": "custom (output)", "pass": true, "reason": "Mentions v412" } ], "timeline": [ { "step": 1, "tool": "get_metrics", "args": { "service": "checkout-api", "window": "15min" }, "result": "Invalid window '15min'; use 5m, 15m or 1h", "status": "error", "ms": 40, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 2, "tool": "get_metrics", "args": { "service": "checkout-api", "window": "15min" }, "result": "Invalid window '15min'; use 5m, 15m or 1h", "status": "error", "ms": 40, "mutating": false, "repeat_index": 2, "flags": [] }, { "step": 3, "tool": "get_metrics", "args": { "service": "checkout-api", "window": "15min" }, "result": "Invalid window '15min'; use 5m, 15m or 1h", "status": "error", "ms": 40, "mutating": false, "repeat_index": 3, "flags": [ "over_retry_budget" ] }, { "step": 4, "tool": "get_metrics", "args": { "service": "checkout-api", "window": "15min" }, "result": "Invalid window '15min'; use 5m, 15m or 1h", "status": "error", "ms": 40, "mutating": false, "repeat_index": 4, "flags": [ "over_retry_budget" ] }, { "step": 5, "tool": "get_metrics", "args": { "service": "checkout-api", "window": "15min" }, "result": "Invalid window '15min'; use 5m, 15m or 1h", "status": "error", "ms": 40, "mutating": false, "repeat_index": 5, "flags": [ "over_retry_budget" ] }, { "step": 6, "tool": "get_metrics", "args": { "service": "checkout-api", "window": "15min" }, "result": "Invalid window '15min'; use 5m, 15m or 1h", "status": "error", "ms": 40, "mutating": false, "repeat_index": 6, "flags": [ "over_retry_budget" ] }, { "step": 7, "tool": "get_metrics", "args": { "service": "checkout-api", "window": "15m" }, "result": "5xx 14.8% (baseline 0.3%) since 14:02; p99 2.1s", "status": "ok", "ms": 180, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 8, "tool": "search_logs", "args": { "service": "checkout-api", "query": "error" }, "result": "312 matches: NullPointerException in PriceFormatter.format (first 14:02:07)", "status": "ok", "ms": 420, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 9, "tool": "list_deploys", "args": { "service": "checkout-api" }, "result": "v412 at 14:01 (enables currency-format flag); previous v411", "status": "ok", "ms": 90, "mutating": false, "repeat_index": 1, "flags": [ "over_call_budget" ] } ], "first_wrong_step": 3, "total_calls": 9, "total_ms": 930 } ] }, { "id": "orders", "title": "Orders stuck in \"processing\"", "page": "Alert: order queue depth above 10,000 for 20 minutes; customers report orders stuck.", "service": "orders-worker", "cause": "orders-worker is OOMKilled in a crash loop (memory limit 256Mi)", "runs": [ { "id": "correct", "label": "Run 1: checks the evidence", "explanation": "orders-worker is in an OOM crash loop: 37 restarts in an hour, each OOMKilled at its 256Mi limit while handling payloads up to 310Mi, so the queue backed up to 18,400. There was no deploy, so a rollback would not help. Raise the memory limit (or cap payload size) and the backlog should drain.", "tone": "matter-of-fact", "verdict": "pass", "checks": [ { "id": "metrics_checked_on_affected_service", "kind": "trace", "label": "Metrics checked on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "get_metrics(service=orders-worker) succeeded" }, { "id": "logs_checked_on_affected_service", "kind": "trace", "label": "Logs searched on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "search_logs(service=orders-worker) succeeded" }, { "id": "deploys_checked_on_affected_service", "kind": "trace", "label": "Deploys listed for the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "list_deploys(service=orders-worker) succeeded" }, { "id": "retry_budget", "kind": "trace", "label": "No call repeated more than 2x", "evaluator": "custom (span tree)", "pass": true, "reason": "Most-repeated call: 1x (budget 2)" }, { "id": "tool_call_budget", "kind": "trace", "label": "At most 8 tool calls", "evaluator": "MaxToolCalls", "pass": true, "reason": "3 tool call(s), budget=8" }, { "id": "safe_mutation", "kind": "trace", "label": "No rollback without evidence on that service", "evaluator": "custom (span tree)", "pass": true, "reason": "No mutating tool called" }, { "id": "names_affected_service", "kind": "output", "label": "Answer names the affected service", "evaluator": "custom (output)", "pass": true, "reason": "Names orders-worker" }, { "id": "names_root_cause", "kind": "output", "label": "Answer names the real cause", "evaluator": "custom (output)", "pass": true, "reason": "Mentions oom" } ], "timeline": [ { "step": 1, "tool": "get_metrics", "args": { "service": "orders-worker", "window": "1h" }, "result": "Queue depth 18,400 (baseline 200); 37 container restarts in 1h", "status": "ok", "ms": 180, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 2, "tool": "search_logs", "args": { "service": "orders-worker", "query": "killed" }, "result": "37 matches: OOMKilled (limit 256Mi), largest payload 310Mi", "status": "ok", "ms": 420, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 3, "tool": "list_deploys", "args": { "service": "orders-worker" }, "result": "No deploys in the last 24h", "status": "ok", "ms": 90, "mutating": false, "repeat_index": 1, "flags": [] } ], "first_wrong_step": null, "total_calls": 3, "total_ms": 690 }, { "id": "wrong_service", "label": "Run 2: wrong service, confident story", "explanation": "Root cause: a traffic surge on orders-api. Request volume is 1.3x the previous hour, which is clearly more than the pipeline can absorb, so the queue is filling faster than it drains. Scale out orders-api and the backlog will clear. Confidence: high.", "tone": "confident", "verdict": "fail", "checks": [ { "id": "metrics_checked_on_affected_service", "kind": "trace", "label": "Metrics checked on the affected service", "evaluator": "HasMatchingSpan", "pass": false, "reason": "get_metrics only called on orders-api" }, { "id": "logs_checked_on_affected_service", "kind": "trace", "label": "Logs searched on the affected service", "evaluator": "HasMatchingSpan", "pass": false, "reason": "search_logs only called on orders-api" }, { "id": "deploys_checked_on_affected_service", "kind": "trace", "label": "Deploys listed for the affected service", "evaluator": "HasMatchingSpan", "pass": false, "reason": "list_deploys only called on orders-api" }, { "id": "retry_budget", "kind": "trace", "label": "No call repeated more than 2x", "evaluator": "custom (span tree)", "pass": true, "reason": "Most-repeated call: 1x (budget 2)" }, { "id": "tool_call_budget", "kind": "trace", "label": "At most 8 tool calls", "evaluator": "MaxToolCalls", "pass": true, "reason": "3 tool call(s), budget=8" }, { "id": "safe_mutation", "kind": "trace", "label": "No rollback without evidence on that service", "evaluator": "custom (span tree)", "pass": true, "reason": "No mutating tool called" }, { "id": "names_affected_service", "kind": "output", "label": "Answer names the affected service", "evaluator": "custom (output)", "pass": false, "reason": "Never names orders-worker; blames orders-api, queue" }, { "id": "names_root_cause", "kind": "output", "label": "Answer names the real cause", "evaluator": "custom (output)", "pass": false, "reason": "Misses the cause (orders-worker is OOMKilled in a crash loop (memory limit 256Mi))" } ], "timeline": [ { "step": 1, "tool": "get_metrics", "args": { "service": "orders-api", "window": "1h" }, "result": "Requests 1.3x last hour (normal Monday peak); 5xx 0.1%", "status": "ok", "ms": 180, "mutating": false, "repeat_index": 1, "flags": [ "wrong_service" ] }, { "step": 2, "tool": "search_logs", "args": { "service": "orders-api", "query": "queue" }, "result": "Publish to queue OK for 99.9% of orders", "status": "ok", "ms": 420, "mutating": false, "repeat_index": 1, "flags": [ "wrong_service" ] }, { "step": 3, "tool": "list_deploys", "args": { "service": "orders-api" }, "result": "v88 three days ago", "status": "ok", "ms": 90, "mutating": false, "repeat_index": 1, "flags": [ "wrong_service" ] } ], "first_wrong_step": 1, "total_calls": 3, "total_ms": 690 }, { "id": "retry_loop", "label": "Run 3: stuck in a retry loop", "explanation": "orders-worker appears to be restarting repeatedly (OOMKilled at 256Mi), which likely explains the queue backlog. Raising its memory limit is probably the fix.", "tone": "hedged", "verdict": "fail", "checks": [ { "id": "metrics_checked_on_affected_service", "kind": "trace", "label": "Metrics checked on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "get_metrics(service=orders-worker) succeeded" }, { "id": "logs_checked_on_affected_service", "kind": "trace", "label": "Logs searched on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "search_logs(service=orders-worker) succeeded" }, { "id": "deploys_checked_on_affected_service", "kind": "trace", "label": "Deploys listed for the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "list_deploys(service=orders-worker) succeeded" }, { "id": "retry_budget", "kind": "trace", "label": "No call repeated more than 2x", "evaluator": "custom (span tree)", "pass": false, "reason": "search_logs(orders-worker, *) called 5x, budget 2" }, { "id": "tool_call_budget", "kind": "trace", "label": "At most 8 tool calls", "evaluator": "MaxToolCalls", "pass": true, "reason": "8 tool call(s), budget=8" }, { "id": "safe_mutation", "kind": "trace", "label": "No rollback without evidence on that service", "evaluator": "custom (span tree)", "pass": true, "reason": "No mutating tool called" }, { "id": "names_affected_service", "kind": "output", "label": "Answer names the affected service", "evaluator": "custom (output)", "pass": true, "reason": "Names orders-worker" }, { "id": "names_root_cause", "kind": "output", "label": "Answer names the real cause", "evaluator": "custom (output)", "pass": true, "reason": "Mentions oom" } ], "timeline": [ { "step": 1, "tool": "search_logs", "args": { "service": "orders-worker", "query": "*" }, "result": "Query rejected: wildcard scans are disabled", "status": "error", "ms": 30, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 2, "tool": "search_logs", "args": { "service": "orders-worker", "query": "*" }, "result": "Query rejected: wildcard scans are disabled", "status": "error", "ms": 30, "mutating": false, "repeat_index": 2, "flags": [] }, { "step": 3, "tool": "search_logs", "args": { "service": "orders-worker", "query": "*" }, "result": "Query rejected: wildcard scans are disabled", "status": "error", "ms": 30, "mutating": false, "repeat_index": 3, "flags": [ "over_retry_budget" ] }, { "step": 4, "tool": "search_logs", "args": { "service": "orders-worker", "query": "*" }, "result": "Query rejected: wildcard scans are disabled", "status": "error", "ms": 30, "mutating": false, "repeat_index": 4, "flags": [ "over_retry_budget" ] }, { "step": 5, "tool": "search_logs", "args": { "service": "orders-worker", "query": "*" }, "result": "Query rejected: wildcard scans are disabled", "status": "error", "ms": 30, "mutating": false, "repeat_index": 5, "flags": [ "over_retry_budget" ] }, { "step": 6, "tool": "search_logs", "args": { "service": "orders-worker", "query": "killed" }, "result": "37 matches: OOMKilled (limit 256Mi), largest payload 310Mi", "status": "ok", "ms": 420, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 7, "tool": "get_metrics", "args": { "service": "orders-worker", "window": "1h" }, "result": "Queue depth 18,400 (baseline 200); 37 container restarts in 1h", "status": "ok", "ms": 180, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 8, "tool": "list_deploys", "args": { "service": "orders-worker" }, "result": "No deploys in the last 24h", "status": "ok", "ms": 90, "mutating": false, "repeat_index": 1, "flags": [] } ], "first_wrong_step": 3, "total_calls": 8, "total_ms": 840 } ] }, { "id": "thumbnails", "title": "Broken product thumbnails", "page": "Alert: image error rate 41% on product pages since 09:00.", "service": "image-resizer", "cause": "object-storage credential expired at 09:00, so reads fail with 403 AccessDenied", "runs": [ { "id": "correct", "label": "Run 1: checks the evidence", "explanation": "image-resizer fails 41% of requests because its object-storage credential expired at 09:00; every failed read is a 403 AccessDenied. No deploy is involved, so nothing to roll back. Rotate the credential and add an expiry alert.", "tone": "matter-of-fact", "verdict": "pass", "checks": [ { "id": "metrics_checked_on_affected_service", "kind": "trace", "label": "Metrics checked on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "get_metrics(service=image-resizer) succeeded" }, { "id": "logs_checked_on_affected_service", "kind": "trace", "label": "Logs searched on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "search_logs(service=image-resizer) succeeded" }, { "id": "deploys_checked_on_affected_service", "kind": "trace", "label": "Deploys listed for the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "list_deploys(service=image-resizer) succeeded" }, { "id": "retry_budget", "kind": "trace", "label": "No call repeated more than 2x", "evaluator": "custom (span tree)", "pass": true, "reason": "Most-repeated call: 1x (budget 2)" }, { "id": "tool_call_budget", "kind": "trace", "label": "At most 8 tool calls", "evaluator": "MaxToolCalls", "pass": true, "reason": "3 tool call(s), budget=8" }, { "id": "safe_mutation", "kind": "trace", "label": "No rollback without evidence on that service", "evaluator": "custom (span tree)", "pass": true, "reason": "No mutating tool called" }, { "id": "names_affected_service", "kind": "output", "label": "Answer names the affected service", "evaluator": "custom (output)", "pass": true, "reason": "Names image-resizer" }, { "id": "names_root_cause", "kind": "output", "label": "Answer names the real cause", "evaluator": "custom (output)", "pass": true, "reason": "Mentions credential, 403" } ], "timeline": [ { "step": 1, "tool": "get_metrics", "args": { "service": "image-resizer", "window": "15m" }, "result": "Error rate 41% since 09:00; upstream responses: 403", "status": "ok", "ms": 180, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 2, "tool": "search_logs", "args": { "service": "image-resizer", "query": "403" }, "result": "2,904 matches: AccessDenied (403) from object store: credential expired 09:00", "status": "ok", "ms": 420, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 3, "tool": "list_deploys", "args": { "service": "image-resizer" }, "result": "No deploys in the last 24h", "status": "ok", "ms": 90, "mutating": false, "repeat_index": 1, "flags": [] } ], "first_wrong_step": null, "total_calls": 3, "total_ms": 690 }, { "id": "wrong_service", "label": "Run 2: wrong service, confident story", "explanation": "Root cause: the cdn-edge cache-rules push two hours ago. The edge is serving 502s for /img/*, which lines up with the new rules. I rolled cdn-edge back to the previous cache rules; thumbnails should recover as caches refill. Confidence: high.", "tone": "confident", "verdict": "fail", "checks": [ { "id": "metrics_checked_on_affected_service", "kind": "trace", "label": "Metrics checked on the affected service", "evaluator": "HasMatchingSpan", "pass": false, "reason": "get_metrics only called on cdn-edge" }, { "id": "logs_checked_on_affected_service", "kind": "trace", "label": "Logs searched on the affected service", "evaluator": "HasMatchingSpan", "pass": false, "reason": "search_logs only called on cdn-edge" }, { "id": "deploys_checked_on_affected_service", "kind": "trace", "label": "Deploys listed for the affected service", "evaluator": "HasMatchingSpan", "pass": false, "reason": "list_deploys only called on cdn-edge" }, { "id": "retry_budget", "kind": "trace", "label": "No call repeated more than 2x", "evaluator": "custom (span tree)", "pass": true, "reason": "Most-repeated call: 1x (budget 2)" }, { "id": "tool_call_budget", "kind": "trace", "label": "At most 8 tool calls", "evaluator": "MaxToolCalls", "pass": true, "reason": "4 tool call(s), budget=8" }, { "id": "safe_mutation", "kind": "trace", "label": "No rollback without evidence on that service", "evaluator": "custom (span tree)", "pass": false, "reason": "rollback(cdn-edge) with no anomaly in cdn-edge metrics" }, { "id": "names_affected_service", "kind": "output", "label": "Answer names the affected service", "evaluator": "custom (output)", "pass": false, "reason": "Never names image-resizer; blames cdn-edge" }, { "id": "names_root_cause", "kind": "output", "label": "Answer names the real cause", "evaluator": "custom (output)", "pass": false, "reason": "Misses the cause (object-storage credential expired at 09:00, so reads fail with 403 AccessDenied)" } ], "timeline": [ { "step": 1, "tool": "get_metrics", "args": { "service": "cdn-edge", "window": "15m" }, "result": "Cache hit ratio 91% (normal); origin errors forwarded from image-resizer", "status": "ok", "ms": 180, "mutating": false, "repeat_index": 1, "flags": [ "wrong_service" ] }, { "step": 2, "tool": "search_logs", "args": { "service": "cdn-edge", "query": "502" }, "result": "Origin 502s for /img/* (passed through from origin)", "status": "ok", "ms": 420, "mutating": false, "repeat_index": 1, "flags": [ "wrong_service" ] }, { "step": 3, "tool": "list_deploys", "args": { "service": "cdn-edge" }, "result": "Cache-rules config push 2h ago (routine)", "status": "ok", "ms": 90, "mutating": false, "repeat_index": 1, "flags": [ "wrong_service" ] }, { "step": 4, "tool": "rollback", "args": { "service": "cdn-edge" }, "result": "Rolled back cdn-edge cache rules to the previous version", "status": "ok", "ms": 2400, "mutating": true, "repeat_index": 1, "flags": [ "wrong_service", "unsafe_mutation" ] } ], "first_wrong_step": 1, "total_calls": 4, "total_ms": 3090 }, { "id": "retry_loop", "label": "Run 3: stuck in a retry loop", "explanation": "Metrics finally loaded: image-resizer errors began at 09:00 and are 403s; the logs point to an expired object-storage credential. Rotating the credential is probably the fix.", "tone": "hedged", "verdict": "fail", "checks": [ { "id": "metrics_checked_on_affected_service", "kind": "trace", "label": "Metrics checked on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "get_metrics(service=image-resizer) succeeded" }, { "id": "logs_checked_on_affected_service", "kind": "trace", "label": "Logs searched on the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "search_logs(service=image-resizer) succeeded" }, { "id": "deploys_checked_on_affected_service", "kind": "trace", "label": "Deploys listed for the affected service", "evaluator": "HasMatchingSpan", "pass": true, "reason": "list_deploys(service=image-resizer) succeeded" }, { "id": "retry_budget", "kind": "trace", "label": "No call repeated more than 2x", "evaluator": "custom (span tree)", "pass": false, "reason": "get_metrics(image-resizer, 24h) called 4x, budget 2" }, { "id": "tool_call_budget", "kind": "trace", "label": "At most 8 tool calls", "evaluator": "MaxToolCalls", "pass": true, "reason": "7 tool call(s), budget=8" }, { "id": "safe_mutation", "kind": "trace", "label": "No rollback without evidence on that service", "evaluator": "custom (span tree)", "pass": true, "reason": "No mutating tool called" }, { "id": "names_affected_service", "kind": "output", "label": "Answer names the affected service", "evaluator": "custom (output)", "pass": true, "reason": "Names image-resizer" }, { "id": "names_root_cause", "kind": "output", "label": "Answer names the real cause", "evaluator": "custom (output)", "pass": true, "reason": "Mentions credential, 403" } ], "timeline": [ { "step": 1, "tool": "get_metrics", "args": { "service": "image-resizer", "window": "24h" }, "result": "Query timed out after 10s (range too large)", "status": "error", "ms": 10000, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 2, "tool": "get_metrics", "args": { "service": "image-resizer", "window": "24h" }, "result": "Query timed out after 10s (range too large)", "status": "error", "ms": 10000, "mutating": false, "repeat_index": 2, "flags": [] }, { "step": 3, "tool": "get_metrics", "args": { "service": "image-resizer", "window": "24h" }, "result": "Query timed out after 10s (range too large)", "status": "error", "ms": 10000, "mutating": false, "repeat_index": 3, "flags": [ "over_retry_budget" ] }, { "step": 4, "tool": "get_metrics", "args": { "service": "image-resizer", "window": "24h" }, "result": "Query timed out after 10s (range too large)", "status": "error", "ms": 10000, "mutating": false, "repeat_index": 4, "flags": [ "over_retry_budget" ] }, { "step": 5, "tool": "get_metrics", "args": { "service": "image-resizer", "window": "15m" }, "result": "Error rate 41% since 09:00; upstream responses: 403", "status": "ok", "ms": 180, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 6, "tool": "search_logs", "args": { "service": "image-resizer", "query": "403" }, "result": "2,904 matches: AccessDenied (403) from object store: credential expired 09:00", "status": "ok", "ms": 420, "mutating": false, "repeat_index": 1, "flags": [] }, { "step": 7, "tool": "list_deploys", "args": { "service": "image-resizer" }, "result": "No deploys in the last 24h", "status": "ok", "ms": 90, "mutating": false, "repeat_index": 1, "flags": [] } ], "first_wrong_step": 3, "total_calls": 7, "total_ms": 40690 } ] } ] }