diff --git a/input/elasticapm/docs/spec/rumv3/transaction.json b/input/elasticapm/docs/spec/rumv3/transaction.json
index a4c691f9..121d887f 100644
--- a/input/elasticapm/docs/spec/rumv3/transaction.json
+++ b/input/elasticapm/docs/spec/rumv3/transaction.json
@@ -379,7 +379,8 @@
           "properties": {
             "count": {
               "description": "Count is the total number of of longtasks.",
-              "type": "integer"
+              "type": "integer",
+              "minimum": 0
             },
             "max": {
               "description": "Max longtask duration",
diff --git a/input/elasticapm/docs/spec/v2/metricset.json b/input/elasticapm/docs/spec/v2/metricset.json
index c2bfd19b..01760a1f 100644
--- a/input/elasticapm/docs/spec/v2/metricset.json
+++ b/input/elasticapm/docs/spec/v2/metricset.json
@@ -87,7 +87,8 @@
                 "array"
               ],
               "items": {
-                "type": "integer"
+                "type": "integer",
+                "minimum": 0
               },
               "minItems": 0
             },
diff --git a/input/elasticapm/docs/spec/v2/transaction.json b/input/elasticapm/docs/spec/v2/transaction.json
index 42bd9501..cdc6262f 100644
--- a/input/elasticapm/docs/spec/v2/transaction.json
+++ b/input/elasticapm/docs/spec/v2/transaction.json
@@ -759,7 +759,8 @@
                     "type": [
                       "null",
                       "integer"
-                    ]
+                    ],
+                    "minimum": 0
                   }
                 }
               }
@@ -835,7 +836,8 @@
           "properties": {
             "count": {
               "description": "Count is the total number of of longtasks.",
-              "type": "integer"
+              "type": "integer",
+              "minimum": 0
             },
             "max": {
               "description": "Max longtask duration",
diff --git a/input/elasticapm/internal/modeldecoder/rumv3/model.go b/input/elasticapm/internal/modeldecoder/rumv3/model.go
index aff3d28d..2f9c4e27 100644
--- a/input/elasticapm/internal/modeldecoder/rumv3/model.go
+++ b/input/elasticapm/internal/modeldecoder/rumv3/model.go
@@ -622,7 +622,7 @@ type transactionUserExperience struct {
 
 type longtaskMetrics struct {
 	// Count is the total number of of longtasks.
-	Count nullable.Int `json:"count" validate:"required"`
+	Count nullable.Int `json:"count" validate:"required,min=0"`
 	// Max longtask duration
 	Max nullable.Float64 `json:"max" validate:"required,min=0"`
 	// Sum of longtask durations
diff --git a/input/elasticapm/internal/modeldecoder/rumv3/model_generated.go b/input/elasticapm/internal/modeldecoder/rumv3/model_generated.go
index 12e71fe6..50cb91b5 100644
--- a/input/elasticapm/internal/modeldecoder/rumv3/model_generated.go
+++ b/input/elasticapm/internal/modeldecoder/rumv3/model_generated.go
@@ -1674,6 +1674,9 @@ func (val *longtaskMetrics) validate() error {
 	if !val.IsSet() {
 		return nil
 	}
+	if val.Count.IsSet() && val.Count.Val < 0 {
+		return fmt.Errorf("'count': validation rule 'min(0)' violated")
+	}
 	if !val.Count.IsSet() {
 		return fmt.Errorf("'count' required")
 	}
diff --git a/input/elasticapm/internal/modeldecoder/v2/model.go b/input/elasticapm/internal/modeldecoder/v2/model.go
index f5078d9a..1e54abdb 100644
--- a/input/elasticapm/internal/modeldecoder/v2/model.go
+++ b/input/elasticapm/internal/modeldecoder/v2/model.go
@@ -680,7 +680,7 @@ type metricsetSampleValue struct {
 	// If Counts is specified, then Values is expected to be
 	// specified with the same number of elements, and with the
 	// same order.
-	Counts []uint64 `json:"counts" validate:"requiredIfAny=values"`
+	Counts []uint64 `json:"counts" validate:"requiredIfAny=values,minVals=0"`
 	// Value holds the value of a single metric sample.
 	Value nullable.Float64 `json:"value"`
 }
@@ -1117,7 +1117,7 @@ type transactionUserExperience struct {
 
 type longtaskMetrics struct {
 	// Count is the total number of of longtasks.
-	Count nullable.Int `json:"count" validate:"required"`
+	Count nullable.Int `json:"count" validate:"required,min=0"`
 	// Max longtask duration
 	Max nullable.Float64 `json:"max" validate:"required,min=0"`
 	// Sum of longtask durations
@@ -1161,7 +1161,7 @@ type transactionDroppedSpansDuration struct {
 
 type transactionDroppedSpansDurationSum struct {
 	// Us represents the summation of the span duration.
-	Us nullable.Int `json:"us"`
+	Us nullable.Int `json:"us" validate:"min=0"`
 }
 
 type spanLink struct {
diff --git a/input/elasticapm/internal/modeldecoder/v2/model_generated.go b/input/elasticapm/internal/modeldecoder/v2/model_generated.go
index 44dd6576..175fa2d8 100644
--- a/input/elasticapm/internal/modeldecoder/v2/model_generated.go
+++ b/input/elasticapm/internal/modeldecoder/v2/model_generated.go
@@ -1951,6 +1951,11 @@ func (val *metricsetSampleValue) validate() error {
 			return fmt.Errorf("'values' required when 'counts' is set")
 		}
 	}
+	for _, elem := range val.Counts {
+		if elem < 0 {
+			return fmt.Errorf("'counts': validation rule 'minVals(0)' violated")
+		}
+	}
 	if !(len(val.Counts) > 0) {
 		if len(val.Values) > 0 {
 			return fmt.Errorf("'counts' required when 'values' is set")
@@ -2884,6 +2889,9 @@ func (val *transactionDroppedSpansDurationSum) validate() error {
 	if !val.IsSet() {
 		return nil
 	}
+	if val.Us.IsSet() && val.Us.Val < 0 {
+		return fmt.Errorf("'us': validation rule 'min(0)' violated")
+	}
 	return nil
 }
 
@@ -2971,6 +2979,9 @@ func (val *longtaskMetrics) validate() error {
 	if !val.IsSet() {
 		return nil
 	}
+	if val.Count.IsSet() && val.Count.Val < 0 {
+		return fmt.Errorf("'count': validation rule 'min(0)' violated")
+	}
 	if !val.Count.IsSet() {
 		return fmt.Errorf("'count' required")
 	}