fix: json marshaling

internal/watcher/health/json.go

@@ -1,6 +1,7 @@
 package health
 
 import (
+	"encoding/json"
 	"net/url"
 	"strconv"
 	"time"
@@ -21,7 +22,7 @@ type JSONRepresentation struct {
 	Extra    map[string]any
 }
 
-func (jsonRepr *JSONRepresentation) MarshalMap() map[string]any {
+func (jsonRepr *JSONRepresentation) MarshalJSON() ([]byte, error) {
 	var url string
 	if jsonRepr.URL != nil {
 		url = jsonRepr.URL.String()
@@ -29,7 +30,7 @@ func (jsonRepr *JSONRepresentation) MarshalMap() map[string]any {
 	if url == "http://:0" {
 		url = ""
 	}
-	return map[string]any{
+	return json.Marshal(map[string]any{
 		"name":        jsonRepr.Name,
 		"config":      jsonRepr.Config,
 		"started":     jsonRepr.Started.Unix(),
@@ -44,5 +45,5 @@ func (jsonRepr *JSONRepresentation) MarshalMap() map[string]any {
 		"detail":      jsonRepr.Detail,
 		"url":         url,
 		"extra":       jsonRepr.Extra,
-	}
+	})
 }

internal/watcher/health/monitor/monitor.go

@@ -179,8 +179,8 @@ func (mon *monitor) String() string {
 	return mon.Name()
 }
 
-// MarshalMap implements health.HealthMonitor.
-func (mon *monitor) MarshalMap() map[string]any {
+// MarshalJSON implements health.HealthMonitor.
+func (mon *monitor) MarshalJSON() ([]byte, error) {
 	res := mon.lastResult.Load()
 	if res == nil {
 		res = &health.HealthCheckResult{
@@ -198,7 +198,7 @@ func (mon *monitor) MarshalMap() map[string]any {
 		LastSeen: GetLastSeen(mon.service),
 		Detail:   res.Detail,
 		URL:      mon.url.Load(),
-	}).MarshalMap()
+	}).MarshalJSON()
 }
 
 func (mon *monitor) checkUpdateHealth() error {

internal/watcher/health/types.go

@@ -1,6 +1,7 @@
 package health
 
 import (
+	"encoding/json"
 	"fmt"
 	"net/url"
 	"time"
@@ -25,6 +26,7 @@ type (
 		fmt.Stringer
 		WithHealthInfo
 		Name() string
+		json.Marshaler
 	}
 	HealthChecker interface {
 		CheckHealth() (result *HealthCheckResult, err error)