Open-Source Tool Detects Silent Failures in gRPC Server-Side Streams

SRE engineer Daniil Romashov has released an open-source tool called grpc-streams-checker to address a blind spot in standard gRPC health monitoring. Traditional HTTP 200 probes and gRPC health checks cannot detect when a stream is technically alive but delivering no data or corrupted payloads. The tool acts as a real client, loading protobuf definitions at runtime, opening streaming RPCs, and collecting multiple frames to verify both sustained data flow and payload validity. It exports results as Prometheus metrics with per-method labels, enabling granular dashboards and targeted alerts for failure modes like timeouts, insufficient frames, and validation errors. The project is available on GitHub under the Apache-2.0 license and ships with Kubernetes manifests, pre-built alert rules, and a demo server with intentional failure modes for testing.