An adaptive dependency replay
control system for use in a latency-sensitive
ad serving backend, comprising: a
microcontroller-based replay control engine configured to receive
ad serving requests and interface with a variety of downstream
microservices; a latency monitoring unit operatively coupled to the
microcontroller, the latency monitoring unit continuously sampling and maintaining real-time latency histograms for each downstream microservice over sliding
time windows; a health status aggregator communicatively coupled to the retry control engine, the aggregator configured to receive service-level health indicators, including, but not limited to, HTTP status codes,
circuit breaker states, request
timeout counters, and error rate thresholds; a retry decision
processing unit stored in a memory accessible to the
microcontroller, wherein the matrix can generate a retry action vector based on one or more of the following factors: dependency health, request priority, estimated ad impression value, and
system resource
metrics; a policy execution engine configured to evaluate retry policies expressed in
a domain-specific retry policy language, wherein the execution engine resolves the policies into
bytecode rules that are executed by the retry control engine in real time on a per-request basis; and at least one fallback path generator capable of returning an approximate or synthetic response instead of retrying a degraded dependency, where the fallback path is selected based on runtime evaluation of the policy conditions and a calculated retry
confidence value.