This method is deprecated or moved on the latest stable version.
The last existing version (v4.2.9) is shown here.
instrument=(boolean)
public
:deprecated:
# File activesupport/lib/active_support/cache.rb, line 183
def self.instrument=(boolean)
ActiveSupport::Deprecation.warn "ActiveSupport::Cache.instrument= is deprecated and will be removed in Rails 5. Instrumentation is now always on so you can safely stop using it."
true
end