Merge pull request #2756 from DataDog/check-info-endpoint-for-config-…

…availability

Check info endpoint for remote configuration availability in the agent

lib/datadog/core/remote/component.rb

@@ -116,6 +116,31 @@ class << self
           def build(settings, agent_settings)
             return unless settings.remote.enabled
 
+            transport_options = {}
+            transport_options[:agent_settings] = agent_settings if agent_settings
+
+            transport_root = Datadog::Core::Transport::HTTP.root(**transport_options.dup)
+
+            res = transport_root.send_info
+            if res.ok?
+              if res.endpoints.include?('/v0.7/config')
+                Datadog.logger.debug { 'agent reachable and reports remote configuration endpoint' }
+              else
+                Datadog.logger.error do
+                  'agent reachable but does not report remote configuration endpoint: ' \
+                    'disabling remote configuration for this process.'
+                end
+
+                return
+              end
+            else
+              Datadog.logger.error do
+                'agent unreachable: disabling remote configuration for this process.'
+              end
+
+              return
+            end
+
             new(settings, agent_settings)
           end
         end