feat(docker): add Prometheus + Grafana monitoring compose overlay

[amir-deris]

Summary

• Adds docker/docker-compose.monitoring.yaml — a compose overlay that attaches Prometheus and Grafana to the existing localnet network alongside the 4-node local cluster
• Adds docker/docker_compose_monitoring/prometheus.yaml — scrape config targeting all four nodes (sei-node-{0-3}:1317) at 5 s intervals
• Adds docker/docker_compose_monitoring/grafana-datasource.yaml — auto-provisions Prometheus as the default Grafana datasource on startup
• Adds make docker-cluster-start-monitoring / make docker-cluster-stop-monitoring Makefile targets and updates docker/README.md to document the combined workflow alongside the existing script-based alternative

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Note

Low Risk
Low risk: adds optional local Docker Compose monitoring services and make targets without changing chain/runtime logic or production configuration.

Overview
Adds a docker-compose.monitoring.yml overlay that runs Prometheus and Grafana on the existing localnet network, including a Prometheus scrape config for all four local nodes and a provisioned Grafana Prometheus datasource.

Introduces make docker-cluster-start-monitoring / make docker-cluster-stop-monitoring to bring the cluster + monitoring stack up/down in one command, and updates docker/README.md to document the combined workflow alongside the existing script-based approach.

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[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	May 19, 2026, 6:09 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.31%. Comparing base (627db96) to head (4f20aa7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3436      +/-   ##
==========================================
+ Coverage   58.96%   59.31%   +0.34%     
==========================================
  Files        2185     2118      -67     
  Lines      181835   174556    -7279     
==========================================
- Hits       107225   103537    -3688     
+ Misses      65008    61997    -3011     
+ Partials     9602     9022     -580     

Flag	Coverage Δ
sei-db	70.41% <ø> (ø)

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see 204 files with indirect coverage changes

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[cursor]

PR Summary

Low Risk
Low risk: changes are limited to local Docker/Makefile tooling and documentation, with no production code or consensus logic impact.

Overview
Adds a Docker Compose monitoring overlay to run Prometheus and Grafana alongside the existing 4-node localnet, including Prometheus scrape config for the four nodes and automatic Grafana provisioning of the Prometheus datasource.

Updates the Makefile to factor shared cluster env vars into CLUSTER_ENV_VARS and introduces make docker-cluster-start-monitoring / make docker-cluster-stop-monitoring to bring the cluster and monitoring stack up/down together, with corresponding docker/README.md documentation.

^{Reviewed by Cursor Bugbot for commit 4f20aa7. Bugbot is set up for automated code reviews on this repo. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

There are 2 total unresolved issues (including 1 from previous review).

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