chore: support for APMs (#2874)

Add the support for Newrelic and Datadog.
ref: https://www.chatwoot.com/docs/self-hosted/monitoring/apm-and-error-monitoring

fixes: #2861

config/initializers/datadog.rb

@@ -0,0 +1,6 @@
+if ENV['DD_TRACE_AGENT_URL']
+  Datadog.configure do |c|
+    # This will activate auto-instrumentation for Rails
+    c.use :rails
+  end
+end

config/initializers/sentry.rb

@@ -1,4 +1,6 @@
-Sentry.init do |config|
-  config.dsn = ENV['SENTRY_DSN']
-  config.enabled_environments = %w[staging production]
+if ENV['SENTRY_DSN']
+  Sentry.init do |config|
+    config.dsn = ENV['SENTRY_DSN']
+    config.enabled_environments = %w[staging production]
+  end
 end

config/newrelic.yml

@@ -0,0 +1,45 @@
+#
+# This file configures the New Relic Agent.  New Relic monitors Ruby, Java,
+# .NET, PHP, Python, Node, and Go applications with deep visibility and low
+# overhead.  For more information, visit www.newrelic.com.
+#
+#
+# For full documentation of agent configuration options, please refer to
+# https://docs.newrelic.com/docs/agents/ruby-agent/installation-configuration/ruby-agent-configuration
+
+common: &default_settings
+  # Required license key associated with your New Relic account.
+  license_key: <%= ENV['NEW_RELIC_LICENSE_KEY'] %>
+
+  # Your application name. Renaming here affects where data displays in New
+  # Relic.  For more details, see https://docs.newrelic.com/docs/apm/new-relic-apm/maintenance/renaming-applications
+  app_name:  <%= ENV.fetch('NEW_RELIC_APP_NAME', 'Chatwoot')  %>
+
+  distributed_tracing:
+    enabled: true
+
+  # To disable the agent regardless of other settings, uncomment the following:
+  agent_enabled: <%= ENV['NEW_RELIC_LICENSE_KEY'].present? && ENV.fetch('NEW_RELIC_AGENT_ENABLED', true)  %>
+
+  # Logging level for log/newrelic_agent.log
+  log_level: <%= ENV.fetch('NEW_RELIC_LOG_LEVEL', 'info')  %>
+
+
+# Environment-specific settings are in this section.
+# RAILS_ENV or RACK_ENV (as appropriate) is used to determine the environment.
+# If your application has other named environments, configure them here.
+development:
+  <<: *default_settings
+  app_name: <%= ENV.fetch('NEW_RELIC_APP_NAME', 'Chatwoot')  %> (Development)
+
+test:
+  <<: *default_settings
+  # It doesn't make sense to report to New Relic from automated test runs.
+  monitor_mode: false
+
+staging:
+  <<: *default_settings
+  app_name: <%= ENV.fetch('NEW_RELIC_APP_NAME', 'Chatwoot')  %> (Staging)
+
+production:
+  <<: *default_settings