Add release notes for v2.1.0

Signed-off-by: David Enyeart <enyeart@us.ibm.com>

release_notes/v2.1.0.md

@@ -1,7 +1,88 @@
+v2.1.0 Release Notes - April 15, 2020
+=====================================
+
+What's New in Hyperledger Fabric v2.1
+-------------------------------------
+
+**FAB-17357: Add endorser metric for simulation failure**
+
+Added metric endorser_proposal_simulation_failures.
+
+**FAB-14761: Limit concurrent requests to endorser and deliver services**
+
+Limits can now be placed on the number of endorser and deliver requests
+that a peer will process at any one time. If a peer is already processing its
+limit of requests, subsequent requests in excess of the limit will return an error,
+and the client will need to retry the call. The limits are configured using the
+following core.yaml properties:
+- peer.limits.concurrency.endorserService
+- peer.limits.concurrency.deliverService
+
+**FAB-17463: Allow peer to override implicit collection dissemination properties**
+
+The following config properties have been added to peer's core.yaml
+for implicit private data collection dissemination:
+- peer.gossip.pvtData.ImplicitCollectionDisseminationPolicy.requiredPeerCount
+- peer.gossip.pvtData.ImplicitCollectionDisseminationPolicy.maxPeerCount
+
+When a peer endorses a transaction that writes to its own organization's
+implicit private data collection, the new properties will dictate how
+many other peers in the organization the endorsing peer will attempt to
+disseminate to (maxPeerCount), and how many peers must acknowledge receipt
+of the private data before endorsement succeeds (requiredPeerCount).
+These properties are applicable to all channels the peer has joined. The implication
+is that requiredPeerCount has to be smaller than the number of peers in a channel
+that has the lowest numbers of peers from the organization.
+
+**FAB-17279: Support collection level endorsement policies for discovery**
+
+v2.0 added an option to specify an endorsement policy at a chaincode's private
+data collection level. Service discovery now supports this feature when the
+collection name is passed to the discovery endorsers query.
+
+**Discover CLI now supports SEC 1 formatted private keys**
+Private keys that are generated with openssl ecparam (SEC 1 format) are now supported
+with the discover CLI, in addition to the PKCS8 private keys that were already supported.
+
+**Dependency updates**
+
+- Bump docker images to Alpine 3.11.
+- Bump Go to 1.14.1.
+- Bump Go grpc to 1.28.0.
 
 Fixes
 -----
 
+All fixes in v2.0.1 have also been applied to v2.1.0. Additionally the following fixes have been made.
+
+**FAB-17441: approveformyorg lifecycle command should allow update of only package ID**
+
+approveformyorg lifecycle command now allows only the package ID to be updated.
+
+**Fix nil dereference in etcdraft config parsing**
+
+The etcdraft config parsing code checked that the consensus
+metadata was not nil, but it failed to check that the options were not nil.
+The additional nil checks have been added.
+
+**FAB-17517: Only Initialize specified BCCSP provider**
+
+When Fabric is built with GO_TAGS="pkcs11",
+BCCSP attempted to initialize PKCS11 even when BCCSP is configured for software.
+This resulted in error
+"Failed to initialize local MSP: could not initialize BCCSP Factories: Failed initializing PKCS11.BCCSP"
+
+**FAB-17672: Prevent gossip probes from registering as long lasting connections**
+
+This fix helps to more quickly establish gossip connections when
+peers are starting at the same time.
+
+**FAB-17726: Properly handle malformed gossip envelopes**
+
+Fix rare nil pointer panic at:
+  github.com/hyperledger/fabric/gossip/comm.interceptAcks.func1(0x0)
+  /opt/gopath/src/github.com/hyperledger/fabric/gossip/comm/ack.go:66 +0x2e
+
 **FAB-17725: Omit go.mod and go.sum from package when not in module mode**
 
 In certain environments, it's possible to package chaincode that is structured
@@ -27,3 +108,6 @@ by the module mode build process.
 
 To help prevent this from occurring, we will explicitly omit go.mod and go.sum
 from top level folder of chaincode that is not packaged in module mode.
+
+For the full list of changes, refer to the release change log:
+https://github.com/hyperledger/fabric/blob/release-2.1/CHANGELOG.md#v210