diff --git a/alerting/provider/custom/custom.go b/alerting/provider/custom/custom.go
index 06e12542..147a9417 100644
--- a/alerting/provider/custom/custom.go
+++ b/alerting/provider/custom/custom.go
@@ -22,10 +22,10 @@ type AlertProvider struct {
 	Placeholders map[string]map[string]string `yaml:"placeholders,omitempty"`
 
 	// ClientConfig is the configuration of the client used to communicate with the provider's target
-	ClientConfig *client.Config `yaml:"client"`
+	ClientConfig *client.Config `yaml:"client,omitempty"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert"`
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
 // IsValid returns whether the provider's configuration is valid
diff --git a/alerting/provider/discord/discord.go b/alerting/provider/discord/discord.go
index 33e279a5..281933d4 100644
--- a/alerting/provider/discord/discord.go
+++ b/alerting/provider/discord/discord.go
@@ -16,7 +16,7 @@ type AlertProvider struct {
 	WebhookURL string `yaml:"webhook-url"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert"`
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
 // IsValid returns whether the provider's configuration is valid
diff --git a/alerting/provider/mattermost/mattermost.go b/alerting/provider/mattermost/mattermost.go
index 964aefc0..38e42d21 100644
--- a/alerting/provider/mattermost/mattermost.go
+++ b/alerting/provider/mattermost/mattermost.go
@@ -16,10 +16,10 @@ type AlertProvider struct {
 	WebhookURL string `yaml:"webhook-url"`
 
 	// ClientConfig is the configuration of the client used to communicate with the provider's target
-	ClientConfig *client.Config `yaml:"client"`
+	ClientConfig *client.Config `yaml:"client,omitempty"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert"`
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
 // IsValid returns whether the provider's configuration is valid
diff --git a/alerting/provider/slack/slack.go b/alerting/provider/slack/slack.go
index e48cf0f6..2de9e5cb 100644
--- a/alerting/provider/slack/slack.go
+++ b/alerting/provider/slack/slack.go
@@ -16,7 +16,7 @@ type AlertProvider struct {
 	WebhookURL string `yaml:"webhook-url"` // Slack webhook URL
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert"`
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
 // IsValid returns whether the provider's configuration is valid
diff --git a/alerting/provider/teams/teams.go b/alerting/provider/teams/teams.go
index e2351ad8..217ad6ea 100644
--- a/alerting/provider/teams/teams.go
+++ b/alerting/provider/teams/teams.go
@@ -16,7 +16,7 @@ type AlertProvider struct {
 	WebhookURL string `yaml:"webhook-url"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert"`
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
 // IsValid returns whether the provider's configuration is valid
diff --git a/alerting/provider/telegram/telegram.go b/alerting/provider/telegram/telegram.go
index 7a109f56..54488d59 100644
--- a/alerting/provider/telegram/telegram.go
+++ b/alerting/provider/telegram/telegram.go
@@ -17,7 +17,7 @@ type AlertProvider struct {
 	ID    string `yaml:"id"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert"`
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
 // IsValid returns whether the provider's configuration is valid
diff --git a/alerting/provider/twilio/twilio.go b/alerting/provider/twilio/twilio.go
index ed0a04e3..17ba2545 100644
--- a/alerting/provider/twilio/twilio.go
+++ b/alerting/provider/twilio/twilio.go
@@ -21,7 +21,7 @@ type AlertProvider struct {
 	To    string `yaml:"to"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert"`
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
 // IsValid returns whether the provider's configuration is valid