diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1b9bb8b7..59eea0f1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -40,6 +40,11 @@ build_csi:
   script: |
     set -x
     VERSION=$(cat version.txt)
+    TAGGED=$(grep 'the version of the Vast CSI driver' charts/vastcsi/values.yaml | awk '{print $2}')
+    if [[ "$TAGGED" != "$VERSION" ]]; then
+      echo "version.txt has $VERSION, while our helm chart has $TAGGED (check charts/vastcsi/values.yaml)"
+      exit 5
+    fi
     LATEST=${DOCKER_REGISTRY}/dev/vast-csi:latest
     if (docker pull $LATEST) ; then
       docker tag $LATEST vast-csi:latest  # the cache-source for our subsequent build
@@ -78,12 +83,11 @@ test_csi:
   except: null
   parallel:
     matrix:
-      - INSTALL_IMAGE: "4.2"
-      - INSTALL_IMAGE: "4.3"
-      - INSTALL_IMAGE: "4.4"
       - INSTALL_IMAGE: "4.5"
       - INSTALL_IMAGE: "4.6"
       - INSTALL_IMAGE: "4.7"
+      - INSTALL_IMAGE: "5.0"
+      - INSTALL_IMAGE: "5.1"
       - INSTALL_IMAGE: "prev_version"
       - INSTALL_IMAGE: "latest"
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0e33ed0f..16984f4b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # CHANGELOG
 
+## Version 2.3.1
+* added volume stats metrics on Node (VCSI-125)
+
 ## Version 2.3.0
 * added CLONE_VOLUME support (VCSI-83)
 * clone volumes from snapshots in READ_WRITE mode (VCSI-103)
diff --git a/README.md b/README.md
index 6d7e0a23..680bd33b 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
 # VAST Data CSI Driver
 
 The source-code in this repository is for informational purposes only. It is not meant to be compiled or used directly.
-If you wish to use our driver with your VAST storage system, please refer to our [official documentation](https://support.vastdata.com/s/topic/0TOV40000000kXVOAY/vast-csi-driver).
+If you wish to use our driver with your VAST storage system, please refer to our [official documentation](https://support.vastdata.com/s/topic/0TOV40000000TtFOAU/vast-csi-driver).
diff --git a/charts/vastcsi/values.yaml b/charts/vastcsi/values.yaml
index cb53ca24..b7ace75f 100644
--- a/charts/vastcsi/values.yaml
+++ b/charts/vastcsi/values.yaml
@@ -124,7 +124,7 @@ snapshotClass:
 image:
   csiVastPlugin:
     repository: vastdataorg/csi
-    tag: v2.3.0
+    tag: v2.3.1  # the version of the Vast CSI driver
     imagePullPolicy: IfNotPresent
   csiAttacher:
     repository: k8s.gcr.io/sig-storage/csi-attacher
diff --git a/vast_csi/server.py b/vast_csi/server.py
index bdc40460..ad04aa04 100644
--- a/vast_csi/server.py
+++ b/vast_csi/server.py
@@ -747,7 +747,7 @@ class Node(NodeServicer, Instrumented):
 
     CAPABILITIES = [
         # types.NodeCapabilityType.STAGE_UNSTAGE_VOLUME,
-        # types.NodeCapabilityType.GET_VOLUME_STATS,
+        types.NodeCapabilityType.GET_VOLUME_STATS,
     ]
 
     def NodeGetCapabilities(self):
@@ -893,6 +893,29 @@ def NodeUnpublishVolume(self, target_path):
     def NodeGetInfo(self):
         return types.NodeInfoResp(node_id=CONF.node_id)
 
+    def NodeGetVolumeStats(self, volume_id, volume_path):
+        if not os.path.ismount(volume_path):
+            raise Abort(NOT_FOUND, f"{volume_path} is not a mountpoint")
+        # See http://man7.org/linux/man-pages/man2/statfs.2.html for details.
+        fstats = os.statvfs(volume_path)
+        return types.VolumeStatsResp(
+            usage=[
+                types.VolumeUsage(
+                    unit=types.UsageUnit.BYTES,
+                    available=fstats.f_bavail * fstats.f_bsize,
+                    total=fstats.f_blocks * fstats.f_bsize,
+                    used=(fstats.f_blocks - fstats.f_bfree) * fstats.f_bsize,
+                ),
+                types.VolumeUsage(
+                    unit=types.UsageUnit.INODES,
+                    available=fstats.f_ffree,
+                    total=fstats.f_files,
+                    used=fstats.f_files - fstats.f_ffree,
+                )
+            ]
+        )
+
+
 
 ################################################################
 #
diff --git a/version.txt b/version.txt
index b1d18bc4..aaf7425f 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-v2.3.0
+v2.3.1