Develop 'System Health' Monitoring Endpoint

[gabito1451]

Context

Automated uptime monitoring for the platform.

Problem

Services like UptimeRobot can only check if the port is open, not if indexing is alive.

Suggested Execution

• Create a '/health' endpoint.
• Checks: DB connection, Redis ping, Soroban RPC lag, Indexer cursor age.

Acceptance Criteria

• Detailed status report for devops.
• 503 error if indexer is more than 1000 ledgers behind.

References

• backend/src/app.controller.ts

[andrianvaleanu]

Getting paged when the port is open but the indexer is stuck is so annoying. It happens to us all the time with RPC lag.

A custom status page at https://pulsetic.com/ might help you track those 503s better once you build taht endpoint.