Integrate PrometheusShmExporter into the RaidenMetricStore facade and add multi-process end-to-end stress tests. - #874
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…ess metric export. Automatically switches the Prometheus telemetry backend to PrometheusShmExporter when TPU_RAIDEN_TELEMETRY_MULTIPROC_DIR is configured, enabling cross-process metric aggregation across TPU workers. PiperOrigin-RevId: 978399948
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Integrate PrometheusShmExporter into the RaidenMetricStore facade and add multi-process end-to-end stress tests.
Wires TPU_RAIDEN_TELEMETRY_BACKENDS=prometheus_shm and TPU_RAIDEN_TELEMETRY_MULTIPROC_DIR configuration flags and verifies metric aggregation across concurrent simulated TPU worker processes.