Great question! This is a real headache for anyone managing equipment long-term. Here's how I approach this tricky situation:

First, to spot genuine EOL vs artificial discontinuation, I look for official manufacturer announcements - real EOL usually comes with clear product lifecycle status updates and formal notices. I also watch for patterns: if a part gets discontinued right before a new model launches, or if the 'replacement' offers only minor cosmetic changes, that's a red flag for artificial obsolescence. Genuine technological advancement should offer substantial improvements, not just force upgrades.

For building a resilient alternative supply chain, my strategy has a few key elements:

1. **Proactive inventory management** - I identify critical 'single points of failure' components (like PLCs, drives, specialized modules) and build buffer stock before they're needed, especially before seasonal peaks.

2. **Standardization** - Where possible, I standardize on common platforms across equipment to reduce the variety of parts needed and simplify technician training.

3. **Alternative sourcing** - I develop relationships with reputable third-party suppliers, authorized distributors, and sometimes even consider compatible alternatives from different manufacturers.

4. **Documentation tracking** - I maintain detailed records of component lifecycles and warranty periods, flagging when parts are nearing expiration so I can use or resell them strategically.

The key is transforming from reactive firefighting to proactive stability planning. It's not just about having parts - it's about having the right parts available before you desperately need them!