app/*: report EL version metric

[KaloyanTanev]

Report EL version if the flag for EL is set.

category: feature
ticket: #4429

[Copilot]

Pull request overview

Adds execution-layer (EL) client version reporting to Charon’s Prometheus metrics so operators can observe the configured EL implementation/version (and get compatibility warnings) alongside existing beacon node version reporting.

Changes:

• Add app_execution_layer_version{version=...} gauge and periodically populate it from web3_clientVersion.
• Extend eth1wrap.EthClientRunner with ClientVersion and implement it (noop + real client + mocks).
• Add EL version parsing/min-version checks with warning logs for unsupported/too-old/incompatible EL versions.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
app/monitoringapi.go	Adds EL version metric collection alongside beacon node version collection.
app/metrics.go	Introduces executionEngineVersionGauge metric definition.
app/eth1wrap/version.go	Adds EL web3_clientVersion parsing and compatibility checks/warnings.
app/eth1wrap/runner.go	Implements ClientVersion RPC call (and noop behavior).
app/eth1wrap/mocks/eth_client_runner.go	Updates generated mock to include ClientVersion.
app/eth1wrap/interface.go	Extends EthClientRunner interface with ClientVersion.
app/app.go	Wires eth1Cl into monitoring API so EL version can be queried.

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 19.35484% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.51%. Comparing base (c89a7ee) to head (d9e3a68).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
app/eth1wrap/version.go	7.89%	34 Missing and 1 partial ⚠️
app/eth1wrap/runner.go	0.00%	12 Missing ⚠️
app/app.go	0.00%	2 Missing ⚠️
app/monitoringapi.go	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4434      +/-   ##
==========================================
+ Coverage   56.47%   56.51%   +0.04%     
==========================================
  Files         244      245       +1     
  Lines       32550    32608      +58     
==========================================
+ Hits        18381    18428      +47     
- Misses      11820    11834      +14     
+ Partials     2349     2346       -3     

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