added prdoc

Signed-off-by: Iulian Barbu <[email protected]>

prdoc/pr_5515.prdoc

@@ -0,0 +1,13 @@
+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: Add retry logic in relay chain rpc interface
+
+doc:
+  - audience: Node Dev, Node Operator
+    description: |
+      Added a basic retry logic for collators connecting to external RPC servers. The collator
+      will try for 5 times to connect to each RPC server from the provided list. In between
+      each iteration will wait a duration which will increase exponentailly by a factor of two.
+      The maximum time a collator can spend in the retry logic is 1 + 2 + 4 + 8 + 16 = 31 seconds.
+crates: [ cumulus-relay-chain-rpc-interface ]