Raise the bouncer memory alert threshold
Raise the bouncer memory alert threshold

- Bouncer currently warns when it hits 2GB of memory
- There are 8 workers on each machine
- The machine has 8GB of memory
- Bouncer is the only application on these machines

I therefore submit the following change for your consideration, where
the warning limits are set to 4GB and the critical limit set to 6GB,
such that we never have to worry about bouncer raising alerts unless
it's going to have a real impact on the machine.

https://graphite.production.alphagov.co.uk/render/?width=1513&height=829&_salt=1414679357.642&target=alias%28sumSeries%28bouncer-1_redirector_production.memory.memory-cached%2Cbouncer-1_redirector_production.memory.memory-free%29%2C%22Memory%20Free%22%29&target=alias%28bouncer-1_redirector_production.processes-app-bouncer.ps_rss%2C%22Bouncer%20Memory%20Usage%22%29&from=00%3A00_20141019&until=23%3A59_20141030

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet