fix(pubsub): enhance message validation and routing robustness #3223
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Description
This PR improves the robustness and monitoring capabilities of PubSub message validation and routing. It addresses potential issues with message handling, adds rate limiting, and introduces comprehensive metrics for better observability.
Changes
Message Validation Improvements
Message Routing Enhancements
New Metrics
Added comprehensive metrics for monitoring:
libp2p_pubsub_message_validation_total
libp2p_pubsub_message_validation_failed_signature
libp2p_pubsub_message_validation_failed_topic
libp2p_pubsub_message_validation_success
libp2p_pubsub_message_validation_time
(histogram)libp2p_pubsub_message_processed_total
libp2p_pubsub_rate_limit_exceeded
libp2p_pubsub_message_dropped_invalid
libp2p_pubsub_message_delivered
libp2p_pubsub_message_processing_time
(histogram)libp2p_pubsub_message_processing_failed