Abstract
This research is dedicated to developing an integrated mathematical model for the comprehensive assessment of Microservice Architecture (MSA) dependability, accounting for both technical failures and cyber threats. 1 The traditional separate analysis of fault tolerance and security is insufficient for adequately evaluating the overall resilience of distributed systems. The methodology employs the apparatus of stochastic modeling (Markov chains), combining reliability metrics (failure rate, restoration rate) and security parameters (attack probability, defense effectiveness). The model calculates the steady-state probability of a single service being operational and the overall system being operational considering architectural complexity. Numerical modeling demonstrated that systemic resilience is exponentially sensitive to security factors and architectural sprawl. Investment in increasing defense effectiveness is identified as a critical multiplicative factor for ensuring system availability in scalable MSA. The proposed model is a practical tool for Site Reliability Engineering (SRE) and cyber resilience assurance.