Sensor โ SW alarm flood
Information + Queueing.
The single idea
Failures are born at interfaces
Each layer optimizes locally.
Foundation modules
Stack Lab
Inject a fault โ trace blast radius
Pick a failure layer.
Typical patterns
Three workshop cases
FPGA stall โ FW timeout
Queueing + Reliability.
Thermal PID โ field derate
Control + Reliability.
SW retry storm โ quota war
Game + Queueing + Reliability.
Cross-domain transfer
Five laws โ one stack
Each foundation module explains a slice of the same incident.
Blast radius
Series chains, bulkheads, MTTR.
Feedback loops
PID, delay, oscillation at boundaries.
Signal vs noise
Metrics, sampling, lossy summaries.
Backpressure
ฯ, buffers, retry queues.
Incentives
Local optima, quotas, mechanism design.
Self-check
Got the end-to-end picture?
Stack sketch.
Pilot modules.
Blame vs analysis.
Layer boundary fixes.