Release notes for EC 2.1.0 (#3054)

* Release notes for EC 2.1.0

* Update rn-embedded-cluster.md

---------

Co-authored-by: Paige Calvert <[email protected]>

Author: ajp-io

docs/release-notes/rn-embedded-cluster.md

@@ -10,6 +10,38 @@ This topic contains release notes for the [Replicated Embedded Cluster](/vendor/
 
 Additionally, these release notes list the versions of Kubernetes and Replicated KOTS that are available with each version of Embedded Cluster.
 
+## 2.1.0
+
+Released on February 14, 2025
+
+<table>
+  <tr>
+    <th>Version</th>
+    <td id="center">2.1.0+k8s-1.30</td>
+    <td id="center">2.1.0+k8s-1.29</td>
+  </tr>
+  <tr>
+    <th>Kubernetes Version</th>
+    <td id="center">1.30.9</td>
+    <td id="center">1.29.13</td>
+  </tr>
+  <tr>
+    <th>KOTS Version</th>
+    <td id="center" colspan="2">1.124.4</td>
+  </tr>
+</table>
+
+### Improvements {#improvements-2-1-0}
+* The following kernel parameters are configured automatically: `net.ipv4.conf.all.forwarding = 1`, `net.ipv4.conf.default.forwarding = 1`, `net.bridge.bridge-nf-call-iptables = 1`, `net.ipv4.conf.default.rp_filter = 0`, and `net.ipv4.conf.all.rp_filter = 0`.
+* The following kernel modules are configured automatically: `overlay`, `ip_tables`, `br_netfilter`, and `nf_conntrack`.
+* Adds a preflight check to ensure the values were set correctly for the `net.ipv4.conf.all.forwarding = 1`, `net.ipv4.conf.default.forwarding = 1`, `net.bridge.bridge-nf-call-iptables = 1`, `net.ipv4.conf.default.rp_filter = 0`, and `net.ipv4.conf.all.rp_filter = 0` kernel parameters.
+* Adds a preflight check to ensure the `overlay`, `ip_tables`, `br_netfilter`, and `nf_conntrack` kernel modules were configured correctly.
+* Adds a preflight check to ensure a node's IP address is not within the Pod and Service CIDR ranges that will be used by Kubernetes. If a conflict exists, a different CIDR block can be specified with `--cidr` or a different network interface can be specified with `--network-interface`.
+* Adds a preflight check to ensure that SELinux is not running in enforcing mode.
+
+### Bug Fixes {#bug-fixes-2-1-0}
+* Fixes an issue when installing on Amazon Linux 2 and other older Linux distributions that causes the installation to timeout waiting for storage to be ready.
+
 ## 2.0.0
 
 Released on February 7, 2025