Release v5.0.11 (#951)

* changelog

* update chunk limit in default configs

config/src/config/state_sync_config.rs

@@ -32,7 +32,7 @@ pub struct StateSyncConfig {
 impl Default for StateSyncConfig {
     fn default() -> Self {
         Self {
-            chunk_limit: 1000,
+            chunk_limit: 250, ///////// 0L ////////
             client_commit_timeout_ms: 5_000,
             long_poll_timeout_ms: 10_000,
             max_chunk_limit: 1000,

ol/changelog/5_0_11.md

@@ -0,0 +1,53 @@
+## 5.0.11
+
+Resolving the Move Cache issue (https://github.com/OLSF/libra/issues/941) will require a two-step upgrade process. 
+
+1. Initially Move changes will be propagated (on chain Hot Upgrade) then, 
+2. later Rust changes will be propagated (Node Upgrade). Read about upgrade types here: ol/documentation/network-upgrades/upgrades.md
+
+v5.0.11, is phase #2, where validators will update their new binaries which are compatible with the Move changes to the chain.
+
+
+### TL;DR Deployment
+
+Validators will be updating the `diem-node` binary. But a refresh of all binaries is recommened.
+
+```
+cd ~/libra
+git fetch
+git checkout v5.0.11 -f
+make bins install
+
+# you can now restart your services
+```
+
+### Summary
+
+Hot Upgrades in the production mainnet run into issues due to Move VM caches not being invalidated when the 0L upgrade is triggered.
+
+### Changes
+
+##### Move Changes
+From issue: https://github.com/OLSF/libra/issues/941
+
+This is Part II of the upgrade Move Cache reset. This includes only Rust changes for v5.0.11, which will be rolled out after the Move changes in v5.0.10 have propagated.
+
+Here there are changes for the diem-node, specifically diem-vm, which will invoke a special Move function Upgrade::upgrade_reconfig, which triggers a new epoch event. This will create "phantom" epochs which last 2 rounds. Since the upgrade tick occurs on round 2, and a new epoch event (including incrementing the epoch number) is required to restart services, this epoch will be shorter.
+However no accounting or payments occur in this epoch.
+
+
+PRs:
+https://github.com/OLSF/libra/pull/946
+
+##### Rust Changes
+
+None 
+
+##### Tests
+
+- All continuous integration tests passed.
+- QA was performed on Rex Devnet.
+
+##### Compatibility
+The Move stdlib and framework changes are backwards compatible with `diem-node` from v5.0.1
+