Don't log the ELB heath checks
Correct logic of client-side-errors switch. ie. if switch is off, don't log
Serve an 'actual' GIF from the px.gif route
Serve an 'actual' GIF from the px.gif route - attempt #2
Log the error averages rather than absolute values
Tab separate the error message etc. for ease of parsing
Add the build number to the diagnostics box
Switched to a Concurrent map with Atomic values
Switched to a Concurrent map with Atomic values
lazy val, not private def, for efficiency
Merge pull request #2198 from guardian/diagnostics-logging

Diagnostics logging