Monitor Test Error!

[gcagrici]

Hi,

When I push the Test Monitor button, I get the following error without any details:

alias(carbon.agents.ip-10-214-134-148-a.avgUpdateTime,"test")

The log of the rails app is:

I, [2014-05-15T14:20:00.907000 #22029] INFO -- : Started GET "/rearview/monitors/index.json" for 10.226.195.119 at 2014-05-15 14:20:00 +0300
I, [2014-05-15T14:20:01.621000 #22029] INFO -- : Started GET "/rearview/help/quick.html" for 10.226.195.119 at 2014-05-15 14:20:01 +0300
I, [2014-05-15T14:20:08.558000 #22029] INFO -- : Started POST "/monitor.json" for 10.226.195.119 at 2014-05-15 14:20:08 +0300
I, [2014-05-15T14:20:08.582000 #22029] INFO -- : Processing by Rearview::MonitorController#create as JSON
I, [2014-05-15T14:20:08.584000 #22029] INFO -- : Parameters: {"id"=>"", "dashboardId"=>"1", "userId"=>"1", "name"=>"TestMonitor", "active"=>"true", "jobType"=>"monitor", "version"=>"2", "cronExpr"=>"0 0 * ? Feb Sun", "errorTimeout"=>"60", "minutes"=>"1", "metrics"=>["alias(carbon.agents.ip-10-214-134-148-a.avgUpdateTime,"test")"], "monitorExpr"=>"", "toDate"=>"now", "createdAt"=>"", "modifiedAt"=>"", "description"=>""}
I, [2014-05-15T14:20:09.116000 #22029] INFO -- : Rendered /usr/local/rvm/gems/jruby-1.7.12/gems/rearview-1.2.1-java/app/views/rearview/monitor/create.json.jbuilder (10.0ms)
I, [2014-05-15T14:20:09.158000 #22029] INFO -- : Completed 200 OK in 531ms (Views: 58.0ms | ActiveRecord: 2.0ms)

Does anybody have any ideas?

[steveakers]

I don't see any errors in that output. Everything looks OK to me.

[gcagrici]

Yep that's the point. I only get the "Monitor Test Error!" message. I am now going through the source code and it looks like

if(t.graph_data) { ...

conditional returns false. Furthermore, although t.status is equals to "error", t.output and t.errors are all null.

Any help?

[steveakers]

Does the metric carbon.agents.ip-10-214-134-148-a.avgUpdateTime exist in your graphite instance?

[gcagrici]

Yes. To confirm that, I renamed the metric to a nonexistent one and that time I got the usual "Monitor Test Error!" message but with a detailed sentence indicating the metric does not exist. On the other hand, when the metric name is true, I only get that "Monitor Test Error!" message. In fact, I can give you RDP access to the machine in case you need.

[steveakers]

Have you tried stopping and starting rearview? Sorry... I'm the product manager, so I'm not being very helpful. Our lead engineer isn't with the company any more.

[gcagrici]

Yes I did that multiple times already.

[javamonkey79]

I am getting the same error. Is this project still active?

[DevinDawson]

Hi all,

I tracked this down. The query issued against graphite is encoding the target as an array rather than repeated key/value pairs. For example, a target of stats.com.foo will result in a query against graphite of http://graphite-1.example.com/render?format=raw&from=23%3A35_20140903&target[]=stats.com.foo&until=23%3A55_20140903

instead of

http://graphite-1.example.com/render?format=raw&from=23%3A35_20140903&target=stats.com.foo&until=23%3A55_20140903

(This occurs even if there is only a single target as the metric is initialized and encoded as an array.)

This has to be patched in the rearview-engine rather than rearview as follows
diff --git a/lib/graphite/client.rb b/lib/graphite/client.rb
index 3c2dd48..911e4a9 100644
--- a/lib/graphite/client.rb
+++ b/lib/graphite/client.rb
@@ -1,9 +1,12 @@
module Graphite
class Client
extend Forwardable
+
attr_reader :connection
def_delegators :@connection, :get, :post
def initialize(options={})

•  # See https://github.com/lostisland/faraday/issues/182
  

•  Faraday::Utils.default_params_encoder = Faraday::FlatParamsEncoder
  

  default_options = {}
  default_options[:ssl] = {
  verify: true,