Add strip_exception_messages option to php agent configuration

[tsuchikazu]

Summary

We want to strip exception messages from error to comply with our corporate security policies.

The strip_exception_messages option exists for other language agents.

• Java
  • https://docs.newrelic.com/docs/apm/agents/java-agent/configuration/java-agent-configuration-config-file/#strip_exceptions
• .NET
  • https://docs.newrelic.com/docs/apm/agents/net-agent/configuration/net-agent-configuration/#strip_exception_messages
• Node.js
  • https://docs.newrelic.com/docs/apm/agents/nodejs-agent/installation-configuration/nodejs-agent-configuration/#err-message-redact
• Python
  • https://docs.newrelic.com/docs/apm/agents/python-agent/configuration/python-agent-configuration/#strip_exception_messages_enabled
• Ruby
  • https://docs.newrelic.com/docs/apm/agents/ruby-agent/configuration/ruby-agent-configuration/#strip_exception_messages-enabled

But the php agent does not have the strip_exception_messages option.

Desired Behavior

Add strip_exception_messages to php agent configuration.

• name: newrelic.strip_exception_messages.enabled
• type: Boolean
• default: false

If strip_exception_messages option is true, php agent strips exception messages from errors.

Possible Solution

The allow_raw_exception_messages option is already exists to strip exception messages. This settings is private.

It would be good to rename this option to strip_exception_messages and publish.