chore: add comment on cancel

Author: vasco-santos

src/handler.js

@@ -183,6 +183,7 @@ async function batchResponse ({ blocks, context, logger }) {
   }
 
   try {
+    logger.info({ key: context.canceled }, 'batch response')
     let message = new Message()
     for (let i = 0; i < blocks.length; i++) {
       const block = blocks[i]
@@ -203,6 +204,7 @@ async function batchResponse ({ blocks, context, logger }) {
         telemetry.increaseLabelCount('bitswap-block-success-cancel', [block.type])
         telemetry.increaseLabelCount('bitswap-cancel-size', [block.type], size)
 
+        logger.info({ key: block.key }, 'delete')
         context.canceled.delete(block.key)
       }
     }