feat: add extra observability metrics for PrometheusMiddleware and Receiver#604

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Mohammed0tarek wants to merge 3 commits intotaskiq-python:masterfrom

Mohammed0tarek:observability/add_full_observability

Commits on Mar 19, 2026

feat: add queue_wait_seconds, task_errors_by_type, and pre_send timestamp to PrometheusMiddleware
Mohammed0tarek
committed
feat: add ReceiverObserver protocol and Prometheus receiver metrics
Mohammed0tarek
committed
fix: clean up lint errors and typos in observability code
Mohammed0tarek
committed