Hey there! That's a really smart question that hits at a common frustration in procurement. I totally get why you're asking - it can feel like you're being pushed into expensive upgrades when the old parts might still be perfectly fine. Here's what I'd watch for:

First, for identifying genuine vs. strategic obsolescence: Look at the manufacturer's official End-of-Life (EOL) notices. Genuine discontinuations usually come with clear timelines (like 6-12 months notice), last-time-buy dates, and sometimes even recommended alternative parts. Strategic obsolescence often feels more sudden and comes with heavy pressure to upgrade immediately.

Red flags in supplier communications to watch for:

1. Sudden urgency without proper documentation - if they're pushing you hard but can't provide official EOL notices or technical justification

2. Vague explanations about 'product lifecycle' or 'technology evolution' without specific technical reasons

3. The new alternative is dramatically more expensive but offers minimal functional improvement for your specific needs

4. They can't provide compatibility information or migration paths - just 'buy the new one'

5. Check if the part is still available through alternative suppliers or the gray market - if it's widely available elsewhere, it might not be truly discontinued

6. Look for patterns - if this manufacturer frequently 'discontinues' parts right before major price increases on new models

My advice? Always ask for the official documentation, check with multiple suppliers, and consider whether the 'upgrade' actually solves a problem you have or just creates new expenses. Sometimes the old part really is obsolete, but other times it's just a sales tactic.