Hey there! As a purchasing manager dealing with component obsolescence, I totally get your concern - it's like trying to predict when your favorite tech gadget will become outdated! Here's what I've learned about staying ahead of the curve:

For tracking data points, you should monitor:

1. Component lifecycle stages - Track where each part is in its lifecycle (introduction, growth, maturity, decline, end-of-life)
2. Manufacturer announcements - Watch for Product Change Notifications (PCNs) and End-of-Life (EOL) notices
3. Market availability - Monitor distributor stock levels and lead time trends
4. Component obsolescence rate - Calculate the value of obsolete inventory versus total inventory
5. Technology trends - Keep an eye on emerging technologies that might replace current components

For building those crucial supplier relationships:

1. Regular communication - Schedule quarterly business reviews and maintain open dialogue
2. Strategic partnerships - Treat key suppliers as partners, not just vendors
3. Share your roadmap - Let suppliers know your long-term plans so they can anticipate your needs
4. Establish clear expectations - Request advance notice of any planned discontinuations
5. Leverage technology - Use obsolescence management tools that integrate with supplier systems

The key is being proactive rather than reactive. Strong supplier relationships often give you early access to last-time buys and preferential treatment when components are being phased out. It's like having a friend on the inside who gives you a heads-up before something disappears from the market!