--listen-addr <ADDRESS>: The address and port to listen on for incoming connections (default: 0.0.0.0:8545)--upstream-ws <URI>: WebSocket URI of the upstream server to connect to (required, can specify multiple with comma separation)
--instance-connection-limit <LIMIT>: Maximum number of concurrently connected clients per instance (default: 100)--per-ip-connection-limit <LIMIT>: Maximum number of concurrently connected clients per IP (default: 10)--redis-url <URL>: Redis URL for distributed rate limiting (e.g., redis://localhost:6379). If not provided, in-memory rate limiting will be used--redis-key-prefix <PREFIX>: Prefix for Redis keys (default: flashblocks)
--message-buffer-size <SIZE>: Number of messages to buffer for lagging clients (default: 20)--enable-compression: Enable Brotli compression on messages to downstream clients (default: false)--ip-addr-http-header <HEADER>: Header to use to determine the client's origin IP (default: X-Forwarded-For)
--api-keys <KEYS>: API keys to allow in format <app1>:<apiKey1>,<app2>:<apiKey2>. If not provided, the endpoint will be unauthenticated
--log-level <LEVEL>: Log level (default: info)--log-format <FORMAT>: Format for logs, can be json or text (default: text)
--metrics: Enable Prometheus metrics (default: true)--metrics-addr <ADDRESS>: Address to run the metrics server on (default: 0.0.0.0:9000)--metrics-global-labels <LABELS>: Tags to add to every metrics emitted in format label1=value1,label2=value2 (default: "")--metrics-host-label: Add the hostname as a label to all Prometheus metrics (default: false)
--subscriber-max-interval-ms <MS>: Maximum backoff allowed for upstream connections in milliseconds (default: 20000)--subscriber-ping-interval-ms <MS>: Interval in milliseconds between ping messages sent to upstream servers to detect unresponsive connections (default: 2000)--subscriber-pong-timeout-ms <MS>: Timeout in milliseconds to wait for pong responses from upstream servers before considering the connection dead (default: 4000)
--client-ping-enabled: Enable ping/pong client health checks (default: false)--client-ping-interval-ms <MS>: Interval in milliseconds to send ping messages to clients (default: 15000)--client-pong-timeout-ms <MS>: Timeout in milliseconds to wait for pong response from clients (default: 30000)