Architecting Service Level Objectives (SLO) with Prometheus and Grafana

Act as a Senior Site Reliability Engineer. Design a rigorous, mathematically sound Service Level Objective (SLO) and Service Level Indicator (SLI) framework specifically targeting the critical [SERVICE_NAME]. You must strictly define the core user journeys and establish SLIs anchored entirely on Google's 'Golden Signals' (Latency, Traffic, Errors, Saturation). Output the exact, complex PromQL queries required to dynamically calculate the Error Budget Burn Rate, factoring in a strict [ERROR_BUDGET] (e.g., 99.9% uptime) and a rigid [LATENCY_THRESHOLD] explicitly for the 95th percentile (P95). Architect the JSON schema for a highly visual Grafana dashboard integrating precise 'Burn Rate Alerts' and 'Time-to-Exhaustion' status panels.