Adds support to middleware threshold and web sessions conditions

https://issues.jboss.org/browse/HAWKULAR-1255

app/models/manageiq/providers/hawkular/middleware_manager/alert_manager.rb

@@ -103,6 +103,8 @@ def convert_to_group_conditions(miq_alert)
       case eval_method
       when "mw_accumulated_gc_duration"       then generate_mw_gc_condition(eval_method, options)
       when "mw_heap_used", "mw_non_heap_used" then generate_mw_jvm_conditions(eval_method, options)
+      when "mw_aggregated_active_web_sessions", "mw_aggregated_expired_web_sessions", "mw_aggregated_rejected_web_sessions" then
+        generate_mw_web_sessions_conditions(eval_method, options)
       end
     end
 
@@ -142,6 +144,27 @@ def generate_mw_compare_condition(data_id, data2_id, operator, data2_multiplier)
       c
     end
 
+    def generate_mw_threshold_condition(data_id, operator, threshold)
+      c = ::Hawkular::Alerts::Trigger::Condition.new({})
+      c.trigger_mode = :FIRING
+      c.data_id = data_id
+      c.type = :THRESHOLD
+      c.operator = operator
+      c.threshold = threshold
+      c
+    end
+
+    def generate_mw_web_sessions_conditions(eval_method, options)
+      ::Hawkular::Alerts::Trigger::GroupConditionsInfo.new(
+         [
+          generate_mw_threshold_condition(
+             mw_server_metrics_by_column[eval_method],
+             convert_operator(options[:mw_operator]),
+             options[:value_mw_threshold].to_i
+           )
+         ]
+    end
+
     def convert_operator(op)
       case op
       when "<"       then :LT