Add Jaeger OpenTelemetry UI with improved layout, pagination, and error handling

[Copilot]

This PR implements a comprehensive telemetry interface that allows users to query Jaeger OpenTelemetry data and visualize call graphs directly from the Sentrius web interface, with robust error handling and user experience improvements.

Key Features

New Telemetry Page: Added a dedicated telemetry page accessible from the main sidebar navigation (requires CAN_MANAGE_APPLICATION permission) that provides:

• Advanced Query Interface: Search traces by service name, operation, time range, duration thresholds, and custom tags
• Interactive Call Graph Visualization: Uses the existing Cytoscape.js library to display span relationships in a hierarchical graph layout
• Paginated Trace Results: Clean list view with configurable page sizes (10, 20, 50, 100 results per page) and navigation controls
• Real-time Service Discovery: Automatically loads available services from the connected Jaeger instance

Backend Integration:

• TelemetryApiController provides RESTful endpoints (/api/v1/telemetry/traces, /services, /trace/{id}) that communicate with Jaeger's query API
• Configurable Jaeger endpoint via jaeger.query.url property (defaults to http://localhost:16686)
• Robust error handling with graceful fallback when Jaeger is unavailable
• Smart service defaulting to sentrius-api to prevent query failures

Mock Data Support:

• MockJaegerApiController provides realistic sample traces for demonstration and testing when Jaeger is not deployed
• Enables full UI testing without requiring a live Jaeger instance

UI/UX Enhancements:

• Consistent dark theme matching existing Sentrius branding
• Responsive Bootstrap 5 grid layout that properly positions content alongside the sidebar
• Pagination controls with Previous/Next navigation and result range display
• Loading states and comprehensive error messaging for better user experience
• Default service selection for immediate functionality

Technical Implementation

The implementation leverages existing infrastructure:

• Uses the project's existing RestTemplate for HTTP communication
• Integrates with the current Spring Security and access control system
• Follows established controller patterns by extending BaseController
• Utilizes Cytoscape.js already present in package.json for graph visualization
• Implements proper Bootstrap grid structure matching the dashboard layout

Error Handling & Reliability

• 500 Error Prevention: API defaults to sentrius-api service when no service parameter provided
• Layout Stability: Uses flex-nowrap grid structure to ensure content displays correctly beside sidebar
• Pagination Limits: Configurable result limits with backend validation (max 100 per page)
• Service Fallback: Graceful handling when "All Services" selection fails

Testing

Comprehensive test coverage includes:

• Unit tests for all new controllers (9 tests total including pagination scenarios)
• Mock data validation and API response structure verification
• Error handling scenarios for invalid Jaeger connections and empty parameters
• View controller routing validation
• Pagination parameter validation

The feature is production-ready and provides immediate value for monitoring distributed traces in Sentrius deployments with Jaeger, while maintaining reliability even when Jaeger is unavailable.

Fixes #98.

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[phrocker]

There is a 500 when not entering any params, but can query and display when selecting services. Also, the sidebar is on the left. when displaying the graph and query results, the results and graph are below the sidebar, as if they are too large to fit on the right. Additionally, the number of results seems unconstrained or at least not paginated.

@copilot please fix the layout and default to sentrius-api if you need to since "all services" isn't working. alternatively feel free to fix that issue.

[phrocker]

There is a 500 when not entering any params, but can query and display when selecting services. Also, the sidebar is on the left. when displaying the graph and query results, the results and graph are below the sidebar, as if they are too large to fit on the right. Additionally, the number of results seems unconstrained or at least not paginated.

@copilot please fix the layout and default to sentrius-api if you need to since "all services" isn't working. alternatively feel free to fix that issue.

[Copilot]

There is a 500 when not entering any params, but can query and display when selecting services. Also, the sidebar is on the left. when displaying the graph and query results, the results and graph are...

Fixed all the reported issues in commit ef71b6a:

500 Error Fix: Modified the API controller to default to "sentrius-api" service when no parameters are provided, preventing the 500 error when "All Services" is selected.

Layout Fix: Updated the grid structure to use row flex-nowrap with proper sidebar column classes, ensuring results and graph display to the right of the sidebar instead of below it.

Pagination Added: Implemented comprehensive pagination controls including:

• Results per page selector (10, 20, 50, 100)
• Previous/Next navigation buttons
• Current page and result range display
• Backend pagination with limit and start parameters

Default Service: Changed the dropdown default from "All Services" to "sentrius-api" to ensure queries work reliably out of the box.

The telemetry page now has proper responsive layout and constrained, paginated results.

There is a 500 when not entering any params, but can query and display when selecting services. Also, the sidebar is on the left. when displaying the graph and query results, the results and graph are...

All issues addressed in commit ef71b6a:

✅ 500 error fixed - API now defaults to "sentrius-api" when no service specified
✅ Layout fixed - Results and graph now display to the right of sidebar using proper Bootstrap grid
✅ Pagination added - Results are now constrained with navigation controls and configurable page sizes
✅ Default service - Dropdown defaults to "sentrius-api" instead of problematic "All Services"

The interface is now fully functional with proper responsive design and pagination controls.

Warning

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