diff --git a/alerting/provider/provider.go b/alerting/provider/provider.go
index 41e8b0fd..06be60c6 100644
--- a/alerting/provider/provider.go
+++ b/alerting/provider/provider.go
@@ -2,6 +2,9 @@ package provider
 
 import (
 	"github.com/TwinProduction/gatus/alerting/provider/custom"
+	"github.com/TwinProduction/gatus/alerting/provider/pagerduty"
+	"github.com/TwinProduction/gatus/alerting/provider/slack"
+	"github.com/TwinProduction/gatus/alerting/provider/twilio"
 	"github.com/TwinProduction/gatus/core"
 )
 
@@ -13,3 +16,11 @@ type AlertProvider interface {
 	// ToCustomAlertProvider converts the provider into a custom.AlertProvider
 	ToCustomAlertProvider(service *core.Service, alert *core.Alert, result *core.Result, resolved bool) *custom.AlertProvider
 }
+
+var (
+	// Validate interface implementation on compile
+	_ AlertProvider = (*custom.AlertProvider)(nil)
+	_ AlertProvider = (*twilio.AlertProvider)(nil)
+	_ AlertProvider = (*slack.AlertProvider)(nil)
+	_ AlertProvider = (*pagerduty.AlertProvider)(nil)
+)
diff --git a/client/client.go b/client/client.go
index 1dad7832..cb8df091 100644
--- a/client/client.go
+++ b/client/client.go
@@ -19,6 +19,8 @@ func GetHTTPClient(insecure bool) *http.Client {
 			insecureHTTPClient = &http.Client{
 				Timeout: time.Second * 10,
 				Transport: &http.Transport{
+					MaxIdleConns:        100,
+					MaxIdleConnsPerHost: 20,
 					TLSClientConfig: &tls.Config{
 						InsecureSkipVerify: true,
 					},
@@ -30,6 +32,10 @@ func GetHTTPClient(insecure bool) *http.Client {
 	if secureHTTPClient == nil {
 		secureHTTPClient = &http.Client{
 			Timeout: time.Second * 10,
+			Transport: &http.Transport{
+				MaxIdleConns:        100,
+				MaxIdleConnsPerHost: 20,
+			},
 		}
 	}
 	return secureHTTPClient
diff --git a/core/condition.go b/core/condition.go
index cd3ce9a7..ec2c7931 100644
--- a/core/condition.go
+++ b/core/condition.go
@@ -155,7 +155,11 @@ func sanitizeAndResolve(list []string, result *Result) []string {
 					if err.Error() != "unexpected end of JSON input" {
 						result.Errors = append(result.Errors, err.Error())
 					}
-					element = fmt.Sprintf("%s %s", element, InvalidConditionElementSuffix)
+					if wantLength {
+						element = fmt.Sprintf("len(%s) %s", element, InvalidConditionElementSuffix)
+					} else {
+						element = fmt.Sprintf("%s %s", element, InvalidConditionElementSuffix)
+					}
 				} else {
 					if wantLength {
 						element = fmt.Sprintf("%d", resolvedElementLength)
diff --git a/core/condition_test.go b/core/condition_test.go
index 45be961a..5ec95e25 100644
--- a/core/condition_test.go
+++ b/core/condition_test.go
@@ -126,6 +126,19 @@ func TestCondition_evaluateWithInvalidBodyJSONPathComplex(t *testing.T) {
 	}
 }
 
+func TestCondition_evaluateWithInvalidBodyJSONPathComplexWithLengthFunction(t *testing.T) {
+	expectedResolvedCondition := "len([BODY].data.name) (INVALID) == john"
+	condition := Condition("len([BODY].data.name) == john")
+	result := &Result{Body: []byte("{\"data\": {\"id\": 1}}")}
+	condition.evaluate(result)
+	if result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a failure, because the path was invalid", condition)
+	}
+	if result.ConditionResults[0].Condition != expectedResolvedCondition {
+		t.Errorf("Condition '%s' should have resolved to '%s', but resolved to '%s' instead", condition, expectedResolvedCondition, result.ConditionResults[0].Condition)
+	}
+}
+
 func TestCondition_evaluateWithBodyJSONPathDoublePlaceholders(t *testing.T) {
 	condition := Condition("[BODY].user.firstName != [BODY].user.lastName")
 	result := &Result{Body: []byte("{\"user\": {\"firstName\": \"john\", \"lastName\": \"doe\"}}")}