From 0a42a9fc8f3da272964a6d14f1cb24fc82f65140 Mon Sep 17 00:00:00 2001
From: Brian Brazil <brian.brazil@robustperception.io>
Date: Thu, 30 Nov 2017 13:49:15 +0000
Subject: [PATCH] Copy over rule group duration on reload.

This is currently getting lost, this will soon be in a metric and we
don't want it dropping to 0 on every reload.
---
 rules/manager.go      | 2 ++
 rules/manager_test.go | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/rules/manager.go b/rules/manager.go
index 27cc78f98..16fb48104 100644
--- a/rules/manager.go
+++ b/rules/manager.go
@@ -284,6 +284,8 @@ func (g *Group) offset() time.Duration {
 // Rules are matched based on their name. If there are duplicates, the
 // first is matched with the first, second with the second etc.
 func (g *Group) copyState(from *Group) {
+	g.evaluationTime = from.evaluationTime
+
 	ruleMap := make(map[string][]int, len(from.rules))
 
 	for fi, fromRule := range from.rules {
diff --git a/rules/manager_test.go b/rules/manager_test.go
index 30e38e922..859118797 100644
--- a/rules/manager_test.go
+++ b/rules/manager_test.go
@@ -266,6 +266,7 @@ func TestCopyState(t *testing.T) {
 			map[string]labels.Labels{"r3a": nil},
 			map[string]labels.Labels{"r3b": nil},
 		},
+		evaluationTime: time.Second,
 	}
 	oldGroup.rules[0].(*AlertingRule).active[42] = nil
 	newGroup := &Group{
@@ -291,6 +292,7 @@ func TestCopyState(t *testing.T) {
 	}
 	testutil.Equals(t, want, newGroup.seriesInPreviousEval)
 	testutil.Equals(t, oldGroup.rules[0], newGroup.rules[3])
+	testutil.Equals(t, oldGroup.evaluationTime, newGroup.evaluationTime)
 }
 
 func TestUpdate(t *testing.T) {