diff --git a/docs/data-sources/observability_instance.md b/docs/data-sources/observability_instance.md
index 0f70fe8c2..c878d930c 100644
--- a/docs/data-sources/observability_instance.md
+++ b/docs/data-sources/observability_instance.md
@@ -44,9 +44,9 @@ data "stackit_observability_instance" "example" {
 - `logs_push_url` (String) Specifies URL for pushing logs.
 - `logs_url` (String) Specifies Logs URL.
 - `metrics_push_url` (String) Specifies URL for pushing metrics.
-- `metrics_retention_days` (Number) Specifies for how many days the raw metrics are kept.
-- `metrics_retention_days_1h_downsampling` (Number) Specifies for how many days the 1h downsampled metrics are kept. must be less than the value of the 5m downsampling retention. Default is set to `0` (disabled).
-- `metrics_retention_days_5m_downsampling` (Number) Specifies for how many days the 5m downsampled metrics are kept. must be less than the value of the general retention. Default is set to `0` (disabled).
+- `metrics_retention_days` (Number) Specifies for how many days the raw metrics are kept. Default is set to `90`.
+- `metrics_retention_days_1h_downsampling` (Number) Specifies for how many days the 1h downsampled metrics are kept. must be less than the value of the 5m downsampling retention. Default is set to `90`.
+- `metrics_retention_days_5m_downsampling` (Number) Specifies for how many days the 5m downsampled metrics are kept. must be less than the value of the general retention. Default is set to `90`.
 - `metrics_url` (String) Specifies metrics URL.
 - `name` (String) The name of the Observability instance.
 - `otlp_traces_url` (String)
diff --git a/docs/guides/using_loadbalancer_with_observability.md b/docs/guides/using_loadbalancer_with_observability.md
index 6e1d982e4..d22edf5da 100644
--- a/docs/guides/using_loadbalancer_with_observability.md
+++ b/docs/guides/using_loadbalancer_with_observability.md
@@ -27,9 +27,9 @@ This guide explains how to configure the STACKIT Loadbalancer product to send me
      name                                   = "example-instance"
      plan_name                              = "Observability-Monitoring-Medium-EU01"
      acl                                    = ["0.0.0.0/0"]
-     metrics_retention_days                 = 30
-     metrics_retention_days_5m_downsampling = 10
-     metrics_retention_days_1h_downsampling = 5
+     metrics_retention_days                 = 90
+     metrics_retention_days_5m_downsampling = 90
+     metrics_retention_days_1h_downsampling = 90
    }
 
    resource "stackit_observability_credential" "observability01-credential" {
diff --git a/docs/resources/observability_instance.md b/docs/resources/observability_instance.md
index 3c8cebbd5..196c5f877 100644
--- a/docs/resources/observability_instance.md
+++ b/docs/resources/observability_instance.md
@@ -18,9 +18,9 @@ resource "stackit_observability_instance" "example" {
   name                                   = "example-instance"
   plan_name                              = "Observability-Monitoring-Medium-EU01"
   acl                                    = ["1.1.1.1/32", "2.2.2.2/32"]
-  metrics_retention_days                 = 30
-  metrics_retention_days_5m_downsampling = 10
-  metrics_retention_days_1h_downsampling = 5
+  metrics_retention_days                 = 90
+  metrics_retention_days_5m_downsampling = 90
+  metrics_retention_days_1h_downsampling = 90
 }
 ```
 
@@ -37,9 +37,9 @@ resource "stackit_observability_instance" "example" {
 
 - `acl` (Set of String) The access control list for this instance. Each entry is an IP address range that is permitted to access, in CIDR notation.
 - `alert_config` (Attributes) Alert configuration for the instance. (see [below for nested schema](#nestedatt--alert_config))
-- `metrics_retention_days` (Number) Specifies for how many days the raw metrics are kept.
-- `metrics_retention_days_1h_downsampling` (Number) Specifies for how many days the 1h downsampled metrics are kept. must be less than the value of the 5m downsampling retention. Default is set to `0` (disabled).
-- `metrics_retention_days_5m_downsampling` (Number) Specifies for how many days the 5m downsampled metrics are kept. must be less than the value of the general retention. Default is set to `0` (disabled).
+- `metrics_retention_days` (Number) Specifies for how many days the raw metrics are kept. Default is set to `90`.
+- `metrics_retention_days_1h_downsampling` (Number) Specifies for how many days the 1h downsampled metrics are kept. must be less than the value of the 5m downsampling retention. Default is set to `90`.
+- `metrics_retention_days_5m_downsampling` (Number) Specifies for how many days the 5m downsampled metrics are kept. must be less than the value of the general retention. Default is set to `90`.
 - `parameters` (Map of String) Additional parameters.
 
 ### Read-Only
diff --git a/examples/resources/stackit_observability_instance/resource.tf b/examples/resources/stackit_observability_instance/resource.tf
index f639359e9..743c7648d 100644
--- a/examples/resources/stackit_observability_instance/resource.tf
+++ b/examples/resources/stackit_observability_instance/resource.tf
@@ -3,7 +3,7 @@ resource "stackit_observability_instance" "example" {
   name                                   = "example-instance"
   plan_name                              = "Observability-Monitoring-Medium-EU01"
   acl                                    = ["1.1.1.1/32", "2.2.2.2/32"]
-  metrics_retention_days                 = 30
-  metrics_retention_days_5m_downsampling = 10
-  metrics_retention_days_1h_downsampling = 5
+  metrics_retention_days                 = 90
+  metrics_retention_days_5m_downsampling = 90
+  metrics_retention_days_1h_downsampling = 90
 }
diff --git a/stackit/internal/services/observability/instance/datasource.go b/stackit/internal/services/observability/instance/datasource.go
index d55a4d292..1f58ea6af 100644
--- a/stackit/internal/services/observability/instance/datasource.go
+++ b/stackit/internal/services/observability/instance/datasource.go
@@ -133,15 +133,15 @@ func (d *instanceDataSource) Schema(_ context.Context, _ datasource.SchemaReques
 				Sensitive:   true,
 			},
 			"metrics_retention_days": schema.Int64Attribute{
-				Description: "Specifies for how many days the raw metrics are kept.",
+				Description: "Specifies for how many days the raw metrics are kept. Default is set to `90`.",
 				Computed:    true,
 			},
 			"metrics_retention_days_5m_downsampling": schema.Int64Attribute{
-				Description: "Specifies for how many days the 5m downsampled metrics are kept. must be less than the value of the general retention. Default is set to `0` (disabled).",
+				Description: "Specifies for how many days the 5m downsampled metrics are kept. must be less than the value of the general retention. Default is set to `90`.",
 				Computed:    true,
 			},
 			"metrics_retention_days_1h_downsampling": schema.Int64Attribute{
-				Description: "Specifies for how many days the 1h downsampled metrics are kept. must be less than the value of the 5m downsampling retention. Default is set to `0` (disabled).",
+				Description: "Specifies for how many days the 1h downsampled metrics are kept. must be less than the value of the 5m downsampling retention. Default is set to `90`.",
 				Computed:    true,
 			},
 			"metrics_url": schema.StringAttribute{
diff --git a/stackit/internal/services/observability/instance/resource.go b/stackit/internal/services/observability/instance/resource.go
index 36b7e4d85..024159da5 100644
--- a/stackit/internal/services/observability/instance/resource.go
+++ b/stackit/internal/services/observability/instance/resource.go
@@ -468,17 +468,17 @@ func (r *instanceResource) Schema(_ context.Context, _ resource.SchemaRequest, r
 				},
 			},
 			"metrics_retention_days": schema.Int64Attribute{
-				Description: "Specifies for how many days the raw metrics are kept.",
+				Description: "Specifies for how many days the raw metrics are kept. Default is set to `90`.",
 				Optional:    true,
 				Computed:    true,
 			},
 			"metrics_retention_days_5m_downsampling": schema.Int64Attribute{
-				Description: "Specifies for how many days the 5m downsampled metrics are kept. must be less than the value of the general retention. Default is set to `0` (disabled).",
+				Description: "Specifies for how many days the 5m downsampled metrics are kept. must be less than the value of the general retention. Default is set to `90`.",
 				Optional:    true,
 				Computed:    true,
 			},
 			"metrics_retention_days_1h_downsampling": schema.Int64Attribute{
-				Description: "Specifies for how many days the 1h downsampled metrics are kept. must be less than the value of the 5m downsampling retention. Default is set to `0` (disabled).",
+				Description: "Specifies for how many days the 1h downsampled metrics are kept. must be less than the value of the 5m downsampling retention. Default is set to `90`.",
 				Optional:    true,
 				Computed:    true,
 			},
diff --git a/stackit/internal/services/observability/observability_acc_test.go b/stackit/internal/services/observability/observability_acc_test.go
index 95828c71a..6c09cc576 100644
--- a/stackit/internal/services/observability/observability_acc_test.go
+++ b/stackit/internal/services/observability/observability_acc_test.go
@@ -69,9 +69,9 @@ var testConfigVarsMax = config.Variables{
 	"alert_annotation": config.StringVariable("annotation1"),
 	"alert_interval":   config.StringVariable("5h"),
 	// max instance
-	"metrics_retention_days":                 config.StringVariable("30"),
-	"metrics_retention_days_5m_downsampling": config.StringVariable("10"),
-	"metrics_retention_days_1h_downsampling": config.StringVariable("5"),
+	"metrics_retention_days":                 config.StringVariable("90"),
+	"metrics_retention_days_5m_downsampling": config.StringVariable("90"),
+	"metrics_retention_days_1h_downsampling": config.StringVariable("90"),
 	"instance_acl_1":                         config.StringVariable("1.2.3.4/32"),
 	"instance_acl_2":                         config.StringVariable("111.222.111.222/32"),
 	"receiver_name":                          config.StringVariable("OpsGenieReceiverInfo"),
diff --git a/templates/guides/using_loadbalancer_with_observability.md.tmpl b/templates/guides/using_loadbalancer_with_observability.md.tmpl
index 6e1d982e4..d22edf5da 100644
--- a/templates/guides/using_loadbalancer_with_observability.md.tmpl
+++ b/templates/guides/using_loadbalancer_with_observability.md.tmpl
@@ -27,9 +27,9 @@ This guide explains how to configure the STACKIT Loadbalancer product to send me
      name                                   = "example-instance"
      plan_name                              = "Observability-Monitoring-Medium-EU01"
      acl                                    = ["0.0.0.0/0"]
-     metrics_retention_days                 = 30
-     metrics_retention_days_5m_downsampling = 10
-     metrics_retention_days_1h_downsampling = 5
+     metrics_retention_days                 = 90
+     metrics_retention_days_5m_downsampling = 90
+     metrics_retention_days_1h_downsampling = 90
    }
 
    resource "stackit_observability_credential" "observability01-credential" {