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Alert instrumentation returning 500 errors
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Description

The follwing Icinga error

PROBLEM - PyBal backends health check on lvs1010 is CRITICAL: PYBAL CRITICAL - Bad Response from pybal: 500 Internal Server Error

is caused by PyBal's alerting endpoint returning an HTTP 500 in certain cases

$ curl http://localhost:9090/alerts

<html>
  <head><title>500 - Request did not return bytes</title></head>
  <body>
    <h1>Request did not return bytes</h1>
    <p>Request: <pre>&lt;Request at 0x7f34ad625878 method=GET uri=/alerts clientproto=HTTP/1.1&gt;</pre><br />Resource: <pre>&lt;pybal.instrumentation.Alerts instance at 0x7f34acd22170&gt;</pre><br />Value: <pre>u'CRITICAL - thumbor_8800: Servers thumbor1004.eqiad.wmnet, thumbor1002.eqiad.wmnet, thumbor1003.eqiad.wmnet are marked down but pooled'</pre></p>
  </body>
</html>

Event Timeline

ema triaged this task as High priority.Jan 11 2018, 1:58 PM

Change 403664 had a related patch set uploaded (by Ema; owner: Ema):
[operations/debs/pybal@master] Alerts instrumentation: return instance of bytes

https://gerrit.wikimedia.org/r/403664

Change 403664 merged by Ema:
[operations/debs/pybal@master] Alerts instrumentation: return instance of bytes

https://gerrit.wikimedia.org/r/403664

Change 403671 had a related patch set uploaded (by Ema; owner: Ema):
[operations/debs/pybal@1.14] Alerts instrumentation: return instance of bytes

https://gerrit.wikimedia.org/r/403671

Change 403671 merged by Ema:
[operations/debs/pybal@1.14] Alerts instrumentation: return instance of bytes

https://gerrit.wikimedia.org/r/403671

Mentioned in SAL (#wikimedia-operations) [2018-01-17T17:06:10Z] <ema> upgrade pybal on primary LVSs to 1.14.3 T184715, T184721

ema claimed this task.
238482n375 lowered the priority of this task from High to Lowest.
238482n375 moved this task from Next Up to In Code Review on the Analytics-Kanban board.
238482n375 edited subscribers, added: 238482n375; removed: Aklapper.

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