diff --git a/charts/arcadedb/README.md b/charts/arcadedb/README.md
index 4bee9f0..919b5f5 100644
--- a/charts/arcadedb/README.md
+++ b/charts/arcadedb/README.md
@@ -218,6 +218,7 @@ Opt-in, behavior-preserving observability (ArcadeDB 26.7.1+). Every knob below d
 | Name                                       | Description                                       | Value   |
 |--------------------------------------------|---------------------------------------------------|---------|
 | `observability.health.readinessRequiresHA` | /api/v1/ready waits for Raft join on HA clusters | `false` |
+| `observability.health.readinessHAMaxLag`   | Max Raft log entries a follower may lag behind commit index and still report Ready (requires readinessRequiresHA) | `100` |
 
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example:
 
diff --git a/charts/arcadedb/templates/_helpers.tpl b/charts/arcadedb/templates/_helpers.tpl
index 3fcb56f..2727766 100644
--- a/charts/arcadedb/templates/_helpers.tpl
+++ b/charts/arcadedb/templates/_helpers.tpl
@@ -203,6 +203,7 @@ All opt-in; emits nothing when defaults are unchanged.
 {{- end }}
 {{- if $health.readinessRequiresHA }}
 - -Darcadedb.server.readinessRequiresHA=true
+- -Darcadedb.server.readinessHAMaxLag={{ $health.readinessHAMaxLag }}
 {{- end }}
 {{- end -}}
 
diff --git a/charts/arcadedb/tests/observability_test.yaml b/charts/arcadedb/tests/observability_test.yaml
index 648be0d..aed2c5a 100644
--- a/charts/arcadedb/tests/observability_test.yaml
+++ b/charts/arcadedb/tests/observability_test.yaml
@@ -19,6 +19,9 @@ tests:
       - notContains:
           path: spec.template.spec.containers[0].command
           content: "-Darcadedb.server.readinessRequiresHA=true"
+      - notContains:
+          path: spec.template.spec.containers[0].command
+          content: "-Darcadedb.server.readinessHAMaxLag=100"
       - notContains:
           path: spec.template.spec.containers[0].command
           content: "-Darcadedb.server.logIncludeTrace=true"
@@ -79,13 +82,33 @@ tests:
           path: spec.template.spec.containers[0].command
           content: "-Darcadedb.serverMetrics.tracing.samplingRate=0.1"
 
-  - it: readinessRequiresHA emits the arg
+  - it: readinessRequiresHA emits the arg plus the default readinessHAMaxLag
     set:
       observability.health.readinessRequiresHA: true
     asserts:
       - contains:
           path: spec.template.spec.containers[0].command
           content: "-Darcadedb.server.readinessRequiresHA=true"
+      - contains:
+          path: spec.template.spec.containers[0].command
+          content: "-Darcadedb.server.readinessHAMaxLag=100"
+
+  - it: readinessHAMaxLag can be overridden
+    set:
+      observability.health.readinessRequiresHA: true
+      observability.health.readinessHAMaxLag: 25
+    asserts:
+      - contains:
+          path: spec.template.spec.containers[0].command
+          content: "-Darcadedb.server.readinessHAMaxLag=25"
+
+  - it: readinessHAMaxLag is not emitted when readinessRequiresHA is false
+    set:
+      observability.health.readinessHAMaxLag: 25
+    asserts:
+      - notContains:
+          path: spec.template.spec.containers[0].command
+          content: "-Darcadedb.server.readinessHAMaxLag=25"
 
   - it: renders without panic when observability is explicitly null
     set:
diff --git a/charts/arcadedb/values.yaml b/charts/arcadedb/values.yaml
index 8e853c8..8dc61c3 100644
--- a/charts/arcadedb/values.yaml
+++ b/charts/arcadedb/values.yaml
@@ -341,3 +341,5 @@ observability:
   health:
     ## @param observability.health.readinessRequiresHA /api/v1/ready waits for Raft join on HA clusters
     readinessRequiresHA: false
+    ## @param observability.health.readinessHAMaxLag Max Raft log entries a follower may lag behind commit index and still report Ready (requires readinessRequiresHA)
+    readinessHAMaxLag: 100