internal_application_error message label is unhelpful

[andrew-pickin-epi]

internal_application_error have a message label. Why?

Consider the following.

internal_application_error{message="Missing template application/render_404 with {:locale=>[:en], :formats=>[:json], :variants=>[], :handlers=>[:raw, :erb, :html, :builder, :ruby, :jbuilder, :haml]}. Searched in:\n  * \"/usr/src/app/app/views\"\n  * \"/usr/local/bundle/gems/govuk_template-0.18.3/app/views\"\n  * \"/usr/local/bundle/gems/lr_common_styles-1.9.0/app/views\"\n"} 8.0
internal_application_error{message="Missing template application/render_404 with {:locale=>[:en], :formats=>[:css], :variants=>[], :handlers=>[:raw, :erb, :html, :builder, :ruby, :jbuilder, :haml]}. Searched in:\n  * \"/usr/src/app/app/views\"\n  * \"/usr/local/bundle/gems/govuk_template-0.18.3/app/views\"\n  * \"/usr/local/bundle/gems/lr_common_styles-1.9.0/app/views\"\n"} 6.0

These are now classed as separate error types, when they shouldn't be.

[tomguilbert]

Take the quantity message off the internal_application_error metric. Should be simple to do - if it isn't then push back to backlog.