feat: Add 'local service' monitor type

This adds a new monitor type to check local services by executing a shell command. It also includes fixes for Prometheus errors when adding new tags and for the UI not updating when tags are changed.

server/model/monitor.js

@@ -148,6 +148,7 @@ class Monitor extends BeanModel {
             httpBodyEncoding: this.httpBodyEncoding,
             jsonPath: this.jsonPath,
             expectedValue: this.expectedValue,
+            local_service_check_type: this.local_service_check_type,
             kafkaProducerTopic: this.kafkaProducerTopic,
             kafkaProducerBrokers: JSON.parse(this.kafkaProducerBrokers),
             kafkaProducerSsl: this.getKafkaProducerSsl(),
@@ -201,6 +202,8 @@ class Monitor extends BeanModel {
                 kafkaProducerSaslOptions: JSON.parse(this.kafkaProducerSaslOptions),
                 rabbitmqUsername: this.rabbitmqUsername,
                 rabbitmqPassword: this.rabbitmqPassword,
+                local_service_command: this.local_service_command,
+                local_service_expected_output: this.local_service_expected_output,
             };
         }