Adding the values for the automatic reloading to the API

```
config_reload_automatic: true,
config_reload_interval: 3
```

Fixes: #5681

Fixes #5780

logstash-core/lib/logstash/api/commands/node.rb

@@ -20,7 +20,7 @@ module LogStash
         def pipeline
           extract_metrics(
             [:stats, :pipelines, :main, :config],
-            :workers, :batch_size, :batch_delay
+            :workers, :batch_size, :batch_delay, :config_reload_automatic, :config_reload_interval
           )
         end
 

logstash-core/lib/logstash/pipeline.rb

@@ -95,7 +95,7 @@ module LogStash; class Pipeline
     queue = LogStash::Util::WrappedSynchronousQueue.new
     @input_queue_client = queue.write_client
     @filter_queue_client = queue.read_client
-    # Note that @infilght_batches as a central mechanism for tracking inflight
+    # Note that @inflight_batches as a central mechanism for tracking inflight
     # batches will fail if we have multiple read clients here.
     @filter_queue_client.set_events_metric(metric.namespace([:stats, :events]))
     @filter_queue_client.set_pipeline_metric(
@@ -206,6 +206,8 @@ module LogStash; class Pipeline
       config_metric.gauge(:workers, pipeline_workers)
       config_metric.gauge(:batch_size, batch_size)
       config_metric.gauge(:batch_delay, batch_delay)
+      config_metric.gauge(:config_reload_automatic, @settings.get("config.reload.automatic"))
+      config_metric.gauge(:config_reload_interval, @settings.get("config.reload.interval"))
 
       @logger.info("Starting pipeline",
                    "id" => self.pipeline_id,

logstash-core/spec/api/lib/api/node_spec.rb

@@ -111,7 +111,9 @@ describe LogStash::Api::Modules::Node do
         "pipeline" => {
           "workers" => Numeric,
           "batch_size" => Numeric,
-          "batch_delay" => Numeric
+          "batch_delay" => Numeric,
+          "config_reload_automatic" => Boolean,
+          "config_reload_interval" => Numeric
         },
         "os" => {
           "name" => String,

logstash-core/spec/api/lib/api/support/resource_dsl_methods.rb

@@ -1,3 +1,13 @@
+# Ruby doesn't have common class for boolean,
+# And to simplify the ResourceDSLMethods check it make sense to have it.
+module Boolean; end
+class TrueClass
+  include Boolean
+end
+class FalseClass
+  include Boolean
+end
+
 module ResourceDSLMethods
   # Convert a nested hash to a mapping of key paths to expected classes
   def hash_to_mapping(h, path=[], mapping={})