aetheris-protocol 0.2.2

syntax = "proto3";
package aetheris.telemetry.v1;

enum TelemetryLevel {
    LEVEL_UNSPECIFIED = 0;
    INFO = 1;
    WARN = 2;
    ERROR = 3;
}

// A single structured log event emitted by the WASM client.
message TelemetryEvent {
    // Unix epoch timestamp in milliseconds (from js_sys::Date::now()).
    uint64 timestamp_ms = 1;
    // Severity level.
    TelemetryLevel level = 2;
    // Structured target tag, e.g. "auth_flow" or "webtransport_handshake".
    string target = 3;
    // Human-readable message. Server truncates to 512 chars and strips control chars.
    string message = 4;
    // Optional round-trip time measurement in milliseconds.
    optional double rtt_ms = 5;
    // 128-bit ULID format for trace identification (26 Crockford Base32 chars).
    // Generated once per GameWorker startup and shared by all events in that session.
    // Allows chronologically sorted log correlation in Jaeger/Loki.
    string trace_id = 6;
    // Logical span name for lifecycle events, e.g. "wasm_init", "render_pipeline_setup".
    // Empty string for plain metric/log events.
    string span_name = 7;
}

// A batch of telemetry events sent in a single gRPC-web (or JSON) call.
message TelemetryBatch {
    repeated TelemetryEvent events = 1;
    // Transient ULID generated on page load to group events from the same
    // browser session. Used for chronological log correlation.
    string session_id = 2;
}

// Empty response — the server acknowledges receipt via HTTP 200.
message TelemetryResponse {}

// Out-of-band diagnostic channel running over gRPC-web (TCP/HTTP).
// Operates independently of WebTransport so it survives QUIC failures.
// Unauthenticated; rate-limited in-process (see crates/aetheris-server/src/telemetry.rs)
// as a DashMap-based per-IP limiter using request.remote_addr() enforcing 60 req/min.
// CAVEAT: Behind proxies, the limiter sees the proxy's IP unless X-Forwarded-For is extracted.
service TelemetryService {
    rpc SubmitTelemetry(TelemetryBatch) returns (TelemetryResponse);
}