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from tasks.base_task import BaseTask
class MediumTask(BaseTask):
def __init__(self) -> None:
self.task_id = "cascading-db-overload"
self.difficulty = "medium"
self.incident_summary = (
"checkout-service and order-processor are degraded. Root signal suggests a "
"Postgres connection pool exhaustion after config drift."
)
self.all_services = [
"postgres",
"checkout-service",
"order-processor",
"auth-service",
]
self.root_cause_service = "postgres"
self.affected_services = ["postgres", "checkout-service", "order-processor"]
self.dependency_graph = {
"postgres": [],
"checkout-service": ["postgres"],
"order-processor": ["postgres", "checkout-service"],
"auth-service": ["postgres"],
}
self.resolution_actions = [
{
"action_type": "update_config",
"params": {
"service": "postgres",
"key": "max_connections",
"value": 50,
},
"allow_string_number": True,
"resolves_fault": True,
"state_updates": {
"postgres": {
"fault_active": False,
"fault_type": None,
"config": {"max_connections": 50},
"metrics": {
"status": "healthy",
"error_rate": 0.03,
"latency_p99_ms": 35.0,
"cpu_percent": 55.0,
},
}
},
},
{
"action_type": "restart_service",
"params": {"service": "checkout-service"},
"resolves_fault": True,
"state_updates": {
"checkout-service": {
"fault_active": False,
"fault_type": None,
"metrics": {
"status": "healthy",
"error_rate": 0.04,
"latency_p99_ms": 300.0,
"cpu_percent": 45.0,
},
}
},
},
{
"action_type": "mark_resolved",
"params": {},
},
]
self.red_herring_services = ["auth-service"]
self.strict_sequence = True
def initial_state(self) -> dict:
return {
"postgres": {
"metrics": {
"service": "postgres",
"cpu_percent": 95.0,
"memory_mb": 3800.0,
"error_rate": 0.80,
"latency_p99_ms": 8000.0,
"status": "degraded",
},
"logs": [
{
"timestamp": "2026-04-11T10:03:00Z",
"service": "postgres",
"level": "FATAL",
"message": "FATAL: remaining connection slots are reserved",
},
{
"timestamp": "2026-04-11T10:03:05Z",
"service": "postgres",
"level": "ERROR",
"message": "connection pool exhausted: max_connections=5",
},
],
"deployments": [
{
"service": "postgres",
"version": "14.11",
"deployed_at": "2026-03-28T03:00:00Z",
"deployed_by": "db-admin",
"config_hash": "cfg-db-overload",
}
],
"config": {"max_connections": 5},
"fault_active": True,
"fault_type": "exhausted_pool",
"current_version": "14.11",
"secondary_fault": False,
"replicas": 1,
},
"checkout-service": {
"metrics": {
"service": "checkout-service",
"cpu_percent": 70.0,
"memory_mb": 900.0,
"error_rate": 0.60,
"latency_p99_ms": 5000.0,
"status": "degraded",
},
"logs": [
{
"timestamp": "2026-04-11T10:03:10Z",
"service": "checkout-service",
"level": "ERROR",
"message": "could not connect to database: too many clients",
}
],
"deployments": [
{
"service": "checkout-service",
"version": "v3.7.0",
"deployed_at": "2026-04-11T08:20:00Z",
"deployed_by": "ci",
"config_hash": "cfg-checkout-370",
}
],
"config": {},
"fault_active": True,
"fault_type": "secondary_db_pressure",
"current_version": "v3.7.0",
"secondary_fault": True,
"requires_restart_after_upstream_fix": True,
"replicas": 4,
},
"order-processor": {
"metrics": {
"service": "order-processor",
"cpu_percent": 65.0,
"memory_mb": 850.0,
"error_rate": 0.55,
"latency_p99_ms": 6200.0,
"status": "degraded",
},
"logs": [
{
"timestamp": "2026-04-11T10:03:12Z",
"service": "order-processor",
"level": "ERROR",
"message": "downstream checkout timeout while acquiring DB session",
}
],
"deployments": [
{
"service": "order-processor",
"version": "v2.9.3",
"deployed_at": "2026-04-11T08:30:00Z",
"deployed_by": "ci",
"config_hash": "cfg-order-293",
}
],
"config": {},
"fault_active": True,
"fault_type": "secondary_cascade",
"current_version": "v2.9.3",
"secondary_fault": True,
"replicas": 3,
},
"auth-service": {
"metrics": {
"service": "auth-service",
"cpu_percent": 25.0,
"memory_mb": 400.0,
"error_rate": 0.05,
"latency_p99_ms": 200.0,
"status": "healthy",
},
"logs": [
{
"timestamp": "2026-04-11T09:58:00Z",
"service": "auth-service",
"level": "WARN",
"message": "deploy event: v1.4.2 rolled out",
}
],
"deployments": [
{
"service": "auth-service",
"version": "v1.4.2",
"deployed_at": "2026-04-11T09:56:00Z",
"deployed_by": "release-bot",
"config_hash": "cfg-auth-142",
}
],
"config": {},
"fault_active": False,
"fault_type": None,
"current_version": "v1.4.2",
"secondary_fault": False,
"replicas": 2,
},
}
def is_resolved(self, state: dict) -> bool:
postgres = state.get("postgres", {})
checkout = state.get("checkout-service", {})
order_proc = state.get("order-processor", {})
return (
postgres.get("fault_active") is False
and checkout.get("fault_active") is False
and order_proc.get("fault_active") is False
)
|