feat(devnet): Add Dynamic Upgrades Dashboard

[refcell]

Summary

Adds an automatically provisioned Grafana dashboard for local devnet dynamic upgrades, linked from the control room with preserved node filters and time range. Adapts the internal chain-overview panels to Prometheus, covering observed schedules, cross-node and EL/CL divergence, read health, and apply diagnostics without treating missing telemetry as healthy zero. Documents usage and adds regression coverage for all 21 queries and 16 behavioral scenarios; provisioning, queries, and rendering were smoke-tested in Grafana 10.4.3 with synthetic metrics rather than a full devnet.

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[depot-code-access]

✅ All benchmarks green — 14 within ±2% (deterministic instruction counts). View run

Benchmark details (14)

Benchmark	Base (target)	Head (this PR)	Δ instructions
batch_queue/drain/drain_cached_span_batches	242,027	242,027	+0.0%
batch_transaction/encode_in_place/encode_in_place	4,199,759	4,199,759	+0.0%
batch_transaction/temporary_frame_buffers/temporary_frame_buffers	8,408,350	8,408,350	+0.0%
flashblock_decode/decode/brotli	3,296,484	3,296,484	+0.0%
flashblock_decode/decode/plain_json	2,280,194	2,280,194	+0.0%
flz/compress_len/real_contract_call	43,148	43,148	+0.0%
flz/compress_len/synthetic_0	38,205	38,205	+0.0%
flz/compress_len/synthetic_1	54,682	54,682	+0.0%
flz/compress_len/synthetic_2	147,976	147,976	+0.0%
flz/data_gas	43,059	43,059	+0.0%
flz/tx_estimated_size	43,056	43,056	+0.0%
frame_parse/decode/single_4kib	1,031	1,031	+0.0%
frame_parse/parse_frames/few_large	1,053,062	1,053,062	+0.0%
frame_parse/parse_frames/many_small	154,763	154,763	+0.0%

[github-actions]

Review Summary

PR: feat(devnet): Add Dynamic Upgrades Dashboard

This PR adds a Grafana dashboard for observing dynamic upgrade signals on the local devnet, a Python test harness validating all 21 PromQL queries against the devnet's Prometheus image, documentation, and a control-room link from the existing devnet dashboard.

Scope: Devnet observability tooling only (JSON, Python, Markdown). No Rust code or block-production paths are affected.

Findings: No issues found. The dashboard structure, PromQL queries, template variables, test coverage, and documentation are all sound.

[depot-code-access]

Base Std historical fork tests

Fork	Result	Passed	Failed	Skipped	base/base	base-anvil	base-std
Beryl	pass	616	0	13	a5de0d46	98e7839c	520d069b
Cobalt	pass	725	0	14	a5de0d46	98e7839c	4571b325

View run

[github-actions]

Nit: re.search(…).group(1) raises an opaque AttributeError: 'NoneType' object has no attribute 'group' if the Prometheus image line is ever removed or reformatted in docker-compose.yml. Consider a guard with a descriptive message:

Suggested change

	image = re.search(r"image:\s*(prom/prometheus:[^\s]+)", compose).group(1)
	match = re.search(r"image:\s*(prom/prometheus:[^\s]+)", compose)
	assert match, "Could not find prom/prometheus image in docker-compose.yml"
	image = match.group(1)

[github-actions]

Review Summary

This PR adds a Grafana dashboard for monitoring dynamic upgrade signals on the local devnet, along with a Python test harness that validates all 21 PromQL queries and 16 behavioral scenarios using promtool in Docker.

Scope: Devnet observability tooling only — no Rust code, no block-production paths, no node logic changes.

What looks good:

• Dashboard correctly distinguishes "no telemetry" from healthy zero throughout (stat panels, descriptions, value mappings).
• PromQL divergence detection properly requires count > 1 to avoid single-reporter false positives.
• Read-error deduplication via max by (job, instance, layer) prevents inflation from per-upgrade counter duplication.
• Empty-schedule reads intentionally omit the upgrade filter, and the test ("empty schedules have no upgrade label") validates this.
• Test harness pulls the exact Prometheus image from docker-compose.yml, ensuring promtool version alignment with the devnet.

One minor finding: posted inline on the test script (re.search without a None guard).

No blocking issues found.