dispatcher: fix test result parsing, build ranges for failure alerts, other fixes

go/src/infra/monitoring/messages/testresults.go

Index: go/src/infra/monitoring/messages/testresults.go
diff --git a/go/src/infra/monitoring/messages/testresults.go b/go/src/infra/monitoring/messages/testresults.go
index 5316c0de0d1a828daa4ac45839d9051457940aaa..b3abb32c3e4e2063783c32c3a634fc8fc9689915 100644
--- a/go/src/infra/monitoring/messages/testresults.go
+++ b/go/src/infra/monitoring/messages/testresults.go
@@ -8,9 +8,10 @@ package messages
 
 // TestResults represents the uploaded results of a set of tests for a build.
 type TestResults struct {
-	BuildNumber       string                `json:"build_number"`
-	SecondsSinceEpoch int64                 `json:"seconds_since_epoch"`
-	Tests             map[string]TestResult `json:"tests"`
+	BuildNumber       string `json:"build_number"`
+	SecondsSinceEpoch int64  `json:"seconds_since_epoch"`
+	// Tests is an arbitrarily nested tree of test names
+	Tests map[string]interface{} `json:"tests"`
 }
 
 // TestResult represents the output of an individual test.