Remove url.full from default OpenTelemetry metrics attributes

[adamw]

Summary

• Remove url.full from default OpenTelemetry metrics request attributes to avoid high-cardinality metric explosion
• Users who need the full URL can opt in via OpenTelemetryDefaults.requestAttributesWithFullUrl
• Add tests verifying url.full is absent by default and present when explicitly opted in

Test plan

• Verify new tests pass: default attributes exclude url.full, requestAttributesWithFullUrl includes it

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This pull request removes the url.full attribute from the default OpenTelemetry metrics to prevent high-cardinality metric explosion, while maintaining backward compatibility through an opt-in method. Additionally, it includes new development container infrastructure for sandboxed development.

Changes:

• Remove url.full from default OpenTelemetry metrics request attributes to avoid high-cardinality issues
• Add tests verifying the default behavior excludes url.full and the opt-in requestAttributesWithFullUrl includes it
• Add comprehensive devcontainer setup with mitmproxy network proxy and WireGuard tunnel for sandboxed development

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
observability/opentelemetry-backend/src/main/scala/sttp/client4/opentelemetry/OpenTelemetryDefaults.scala	Removed url.full from default requestAttributes method and removed unused Response import
observability/opentelemetry-backend/src/test/scala/sttp/client4/opentelemetry/OpenTelemetryMetricsBackendTest.scala	Added tests verifying url.full is absent by default and present when using requestAttributesWithFullUrl
.devcontainer/sandcat/settings.example.json	Example settings file for sandcat development environment configuration
.devcontainer/sandcat/scripts/wg-client-init.sh	WireGuard client initialization script for network tunnel setup
.devcontainer/sandcat/scripts/mitmproxy_addon.py	Mitmproxy addon for network access rules and secret substitution
.devcontainer/sandcat/scripts/app-user-init.sh	User-level initialization script for development container setup
.devcontainer/sandcat/scripts/app-post-start.sh	Post-start hook to remove forwarded credential sockets
.devcontainer/sandcat/scripts/app-init.sh	Main entrypoint for development containers with CA cert installation
.devcontainer/sandcat/compose-proxy.yml	Docker Compose configuration for mitmproxy and WireGuard client services
.devcontainer/sandcat/Dockerfile.wg-client	Dockerfile for WireGuard client container
.devcontainer/devcontainer.json	VS Code devcontainer configuration with security settings
.devcontainer/compose-all.yml	Main Docker Compose file integrating proxy and application services
.devcontainer/Dockerfile.app	Dockerfile for main application development container

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