add details on what happens when a feed is shutdown (#3276)

* add details on what happens when a feed is shutdown

* formatting + slight wording adjustment

---------

Co-authored-by: devin distefano <[email protected]>

Author: sebastian-lerner-link

reports/llms-report.json

@@ -1,5 +1,5 @@
 {
-  "startedAt": "2025-12-09T23:41:23.311Z",
+  "startedAt": "2025-12-10T23:13:13.756Z",
   "siteBase": "https://docs.chain.link",
   "sections": [
     {
@@ -38,9 +38,9 @@
       "section": "data-feeds",
       "pagesProcessed": 37,
       "outputPath": "src/content/data-feeds/llms-full.txt",
-      "bytes": 302589,
-      "prevBytes": 302327,
-      "deltaBytes": 262
+      "bytes": 302816,
+      "prevBytes": 302589,
+      "deltaBytes": 227
     },
     {
       "section": "data-streams",
@@ -123,5 +123,5 @@
       "deltaBytes": 0
     }
   ],
-  "finishedAt": "2025-12-09T23:41:27.135Z"
+  "finishedAt": "2025-12-10T23:13:17.715Z"
 }

src/content/data-feeds/llms-full.txt

@@ -3216,6 +3216,14 @@ Data feeds managed by Chainlink Labs will be considered for deprecation if they
 
 Known users of these feeds will be contacted directly about the feeds' deprecation. Notifications will also be posted on the [Feeds Scheduled For Deprecation](/data-feeds/deprecating-feeds) page and on our [Discord channel](https://discord.com/channels/592041321326182401/991444378335838318) with two weeks of notice before they are shut down.
 
+
+<Aside type="note" title="Data Feed Shutdown Behavior">
+  Once a feed is shutdown, calls to the feed will behave as follows:
+
+  - `lastAnswer` will return `0`
+  - `latestRoundData` will revert with no data available
+</Aside>
+
 ## Market hours
 
 In addition to categories, be aware that markets for several assets are actively traded only during certain hours. Listed data feeds include an attribute describing their market hours. Chainlink Labs recommends using these feeds only during their specified hours:

src/content/data-feeds/selecting-data-feeds.mdx

@@ -103,6 +103,13 @@ Data feeds managed by Chainlink Labs will be considered for deprecation if they
 
 Known users of these feeds will be contacted directly about the feeds' deprecation. Notifications will also be posted on the [Feeds Scheduled For Deprecation](/data-feeds/deprecating-feeds) page and on our [Discord channel](https://discord.com/channels/592041321326182401/991444378335838318) with two weeks of notice before they are shut down.
 
+{/* prettier-ignore */}
+<Aside type="note" title="Data Feed Shutdown Behavior">
+  Once a feed is shutdown, calls to the feed will behave as follows: 
+  - `lastAnswer` will return `0` 
+  - `latestRoundData` will revert with no data available
+</Aside>
+
 ## Market hours
 
 In addition to categories, be aware that markets for several assets are actively traded only during certain hours. Listed data feeds include an attribute describing their market hours. Chainlink Labs recommends using these feeds only during their specified hours: