We debug and found it to be a duplicate agent with the same GUID issue. 
This got repeated again now. 

https://github.com/gocd/gocd/issues/3844

Please lemme if you need any other information. 



On Thursday, 13 April 2017 10:16:33 UTC+5:30, Ketan Padegaonkar wrote:
>
> Can you log an issue on github with the complete stack trace?
>
> On Thu, Apr 13, 2017 at 4:46 AM Santhosh Basavaraju <[email protected] 
> <javascript:>> wrote:
>
>> Hi ,
>>
>> All the agents from the Agents tab disappeared suddenly and when i click 
>> in the "Agents" tab i got the below error in go server logs. Go server 
>> restart didn't help. 
>>
>> 2017-04-12 17:08:10,952 FATAL [qtp999661724-6576104] Rails:? - 
>>
>> ActionController::UrlGenerationError (No route matches 
>> {:action=>"update", :controller=>"api_v4/agents", :uuid=>""} missing 
>> required keys: [:uuid]):
>>
>>   app/controllers/application_controller.rb:196:in `url_for'
>>
>>   app/presenters/api_v4/agent_representer.rb:27:in `AgentRepresenter'
>>
>>   app/presenters/api_v3/base_representer.rb:102:in `to_hash'
>>
>>   app/presenters/api_v3/base_representer.rb:102:in `to_hash'
>>
>>   app/controllers/api_v4/agents_controller.rb:27:in `index'
>>
>>   lib/jetty_weak_etag_middleware.rb:35:in `call'
>>
>>   lib/catch_json_parse_errors.rb:8:in `call'
>>
>>
>> I realized it was a UI issue and the agents were all working fine as my 
>> pipelines worked without any issue.
>>
>>
>> In what case do we face this issue? 
>>
>>
>> Regards
>>
>> San
>>
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