feat(node_monitor): monitor empty blocks and SR set #104
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What does this PR do?
Add a Tron node monitoring service (tools/node_monitor) that detects empty blocks and SR set changes, exposes Prometheus metrics on 0.0.0.0:9098, and is runnable via Docker Compose with YAML-based config.
Why are these changes required?
To provide a single, configurable monitor on empty blocks and SR set change for multiple Tron nodes, with reliable empty-block/SR metrics that can be scraped by Prometheus/Thanos and visualized in Grafana.
This PR has been tested by:
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Extra details
Config is now YAML-only (-config), and the default metrics port is 9098.