Add operational checklist to PR template

PULL_REQUEST_TEMPLATE.md

@@ -4,16 +4,53 @@
 
 ## Test
 
-#### Test Coverage Data
+### Unit Test Coverage
 
-<!-- run 'go test -cover' in the directory you made change -->
+Before:
 
-* Before
+```
-* After
+<!-- copy/paste 'go test -cover' result in the directory you made change -->
+```
 
-#### Test/Run Logs
+After:
+
+```
+<!-- copy/paste 'go test -cover' result in the directory you made change -->
+```
+
+### Test/Run Logs
 
 <!-- links to the test/run log, or copy&paste part of the log if it is too long -->
 <!-- or you may just create a [gist](https://gist.github.com/) and link the gist here -->
 
+## Operational Checklist
+
+1. **Does this PR introduce backward-incompatible changes to the on-disk data structure and/or the over-the-wire protocol?**. (If no, skip to question 8.)
+
+    **YES|NO**
+
+2. **Describe the migration plan.**. For each flag epoch, describe what changes take place at the flag epoch, the anticipated interactions between upgraded/non-upgraded nodes, and any special operational considerations for the migration.
+
+3. **Describe how the plan was tested.**
+
+4. **How much minimum baking period after the last flag epoch should we allow on Pangaea before promotion onto mainnet?**
+
+5. **What are the planned flag epoch numbers and their ETAs on Pangaea?**
+
+6. **What are the planned flag epoch numbers and their ETAs on mainnet?**
+
+    Note that this must be enough to cover baking period on Pangaea.
+
+7. **What should node operators know about this planned change?**
+
+8. **Does this PR introduce backward-incompatible changes *NOT* related to on-disk data structure and/or over-the-wire protocol?** (If no, continue to question 11.)
+
+    **YES|NO**
+
+9. **Does the existing `node.sh` continue to work with this change?**
+
+10. **What should node operators know about this change?**
+
+11. **Describe this PR introduce significant changes to the operational requirements of the node software, such as >20% increase in CPU, memory, and/or disk usage?**
+
 ## TODO