feat(metrics): add block transaction count and SR set change monitoring#6624

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warku123 wants to merge 10 commits intotronprotocol:developfrom

warku123:metric_modify_clean

Commits on Mar 24, 2026

feat(metrics): add block transaction count histogram for empty block monitoring
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Commits on Apr 1, 2026

Modify blank to passed the ci check
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Commits on Apr 2, 2026

refactor(metrics): extract MINER_LABEL constant for histogram labels
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Commits on Apr 8, 2026

refactor(metrics): address PR review feedback

warku123
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claude
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fix(metrics): wrap long line to pass checkstyle 100-char limit

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Commits on Apr 9, 2026

refactor(metrics): reuse txCount variable to avoid repeated calls

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