Add Trading Limit tracking and grafana charts

[chapati23]

Description

This PR adds comprehensive monitoring for trading limits in the Broker contract and improves the overall alerting infrastructure.

✨ Features

• Trading Limits Dashboard Panels - Added three new Grafana panels to visualize trading limit utilization:
  • L0 Short-term limit utilization
  • L1 Medium-term limit utilization
  • Global lifetime limit utilization

🐛 Bug Fixes & Improvements

• Dashboard Organization: Reorganized panel IDs and Y-positions using calculated offsets for better maintainability
• Enhanced trading mode alert messages with Chainlink data feed links
• Removed unnecessary TODO comment about scaling bignumbers
• Improved metric value logging with JSON.stringify for better debugging

How to review

1. Check out this branch locally

git fetch origin
git checkout feat/add-trading-limits

2. Verify Trading Limits Metrics Work

# Build and start the service
pnpm install
pnpm build
pnpm start

Then check the Prometheus endpoint at http://localhost:9090/metrics and verify you see metrics like:

• Broker_tradingLimitsState_netflow0
• Broker_tradingLimitsState_netflow1
• Broker_tradingLimitsState_netflowGlobal
• Broker_tradingLimitsConfig_limit0
• Broker_tradingLimitsConfig_limit1
• Broker_tradingLimitsConfig_limitGlobal

3. Review the Dashboard

The grafana dashboard should have a Trading LImits section now https://clabsmento.grafana.net/d/ee2mj53n58v0ge/aegis-on-chain-metrics?from=now-30m&to=now&orgId=1&timezone=browser

4. Review the Code

Focus on these key areas:

• Check the new multi-gauge support in metric.ts
• Verify the new trading limits configuration validation logic