feat(builder): add RLP block size metrics#1866
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mattsse
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Jan 6, 2026
Zygimantass
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Jan 11, 2026
### Motivation - Add visibility into the RLP-encoded size of built blocks so operators can monitor block size and investigate block-too-large or gas/rlp-related issues. - Provide both a histogram and a latest-value gauge to expose per-payload and last-payload RLP size in metrics dashboards. - Avoid duplicate work by computing the RLP length once and reusing it for the Osaka block size check and metric reporting. ### Description - Added `rlp_block_size_bytes` (histogram) and `rlp_block_size_bytes_last` (gauge) to `TempoPayloadBuilderMetrics` in `crates/payload/builder/src/metrics.rs`. - Compute `rlp_block_size_bytes = sealed_block.rlp_length()` in `crates/payload/builder/src/lib.rs` and reuse it for the Osaka max-size check and error payload. - Record the new metrics with `self.metrics.rlp_block_size_bytes.record(...)` and `self.metrics.rlp_block_size_bytes_last.set(...)` right after payload finalization. ### Testing - Ran `cargo fmt`, which completed successfully but emitted warnings about unstable rustfmt options. - No additional automated tests were executed as part of this change. ------ [Codex Task](https://chatgpt.com/codex/tasks/task_b_695cf977cc5c83219d1ea3383dcca640)
dankrad
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Jan 12, 2026
### Motivation - Add visibility into the RLP-encoded size of built blocks so operators can monitor block size and investigate block-too-large or gas/rlp-related issues. - Provide both a histogram and a latest-value gauge to expose per-payload and last-payload RLP size in metrics dashboards. - Avoid duplicate work by computing the RLP length once and reusing it for the Osaka block size check and metric reporting. ### Description - Added `rlp_block_size_bytes` (histogram) and `rlp_block_size_bytes_last` (gauge) to `TempoPayloadBuilderMetrics` in `crates/payload/builder/src/metrics.rs`. - Compute `rlp_block_size_bytes = sealed_block.rlp_length()` in `crates/payload/builder/src/lib.rs` and reuse it for the Osaka max-size check and error payload. - Record the new metrics with `self.metrics.rlp_block_size_bytes.record(...)` and `self.metrics.rlp_block_size_bytes_last.set(...)` right after payload finalization. ### Testing - Ran `cargo fmt`, which completed successfully but emitted warnings about unstable rustfmt options. - No additional automated tests were executed as part of this change. ------ [Codex Task](https://chatgpt.com/codex/tasks/task_b_695cf977cc5c83219d1ea3383dcca640)
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Motivation
Description
rlp_block_size_bytes(histogram) andrlp_block_size_bytes_last(gauge) toTempoPayloadBuilderMetricsincrates/payload/builder/src/metrics.rs.rlp_block_size_bytes = sealed_block.rlp_length()incrates/payload/builder/src/lib.rsand reuse it for the Osaka max-size check and error payload.self.metrics.rlp_block_size_bytes.record(...)andself.metrics.rlp_block_size_bytes_last.set(...)right after payload finalization.Testing
cargo fmt, which completed successfully but emitted warnings about unstable rustfmt options.Codex Task