Postpone metric registration in adapters until all configuration applied

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## not released
+
+### Fixed
+
+ - Default tags were not sent to adapters for metrics declared before `default_tag` declaration. [@Envek]
+
 ## 0.5.0 - 2020-01-29
 
 ### Added

lib/yabeda.rb

@@ -60,6 +60,7 @@ def configured?
 
     # Perform configuration: registration of metrics and collector blocks
     # @return [void]
+    # rubocop: disable Metrics/MethodLength, Metrics/AbcSize
     def configure!
       raise(AlreadyConfiguredError, @configured_by) if already_configured?
 
@@ -69,8 +70,17 @@ def configure!
         group nil
       end
 
+      # Register metrics in adapters after evaluating all configuration blocks
+      # to ensure that all global settings (like default tags) will be applied.
+      adapters.each_value do |adapter|
+        metrics.each_value do |metric|
+          adapter.register!(metric)
+        end
+      end
+
       @configured_by = caller_locations(1, 1)[0].to_s
     end
+    # rubocop: enable Metrics/MethodLength, Metrics/AbcSize
 
     # Forget all the configuration.
     # For testing purposes as it doesn't rollback changes in adapters.

lib/yabeda/dsl/class_methods.rb

@@ -68,7 +68,6 @@ def register_metric(metric)
         name = [metric.group, metric.name].compact.join("_")
         ::Yabeda.define_singleton_method(name) { metric }
         ::Yabeda.metrics[name] = metric
-        ::Yabeda.adapters.each_value { |adapter| adapter.register!(metric) }
         register_group_for(metric) if metric.group
         metric
       end