feat: discourse plugin for sending apm traces to elastic (#1)

* feat: discourse plugin for sending apm traces to elastic

* move all code inside the module

Author: marcmrf

.discourse-compatibility

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+module.exports = require("@discourse/lint-configs/eslint");

.eslintrc.cjs

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+node_modules
+/gems
+/auto_generated

.gitignore

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+module.exports = require("@discourse/lint-configs/prettier");

.prettierrc.cjs

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+inherit_gem:
+  rubocop-discourse: stree-compat.yml

.rubocop.yml

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+module.exports = require("@discourse/lint-configs/template-lint");

.template-lintrc.cjs

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+group :development do
+  gem "rubocop-discourse"
+  gem "syntax_tree"
+end

Gemfile

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+The MIT License (MIT)
+
+Copyright (c) Civilized Discourse Construction Kit, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

LICENSE

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-# discourse-plugin-elastic-apm
+# discourse-plugin-elastic-apm
+
+Refer here for configuration options
+
+https://www.elastic.co/guide/en/apm/agent/ruby/current/configuration.html
+
+Currently, plugin just allows to configure via discourse admin dashboard the following options:
+
+* server_url
+* service_name
+* secret_token
+* transaction_sample_rate
+* elastic_apm_log_level
+
+In top of that, extra options can be configured via env variables or the elastic apm page itself. Agent will be pulling for config updates.
+
+NOTE: un order to make the plugin work, rak mini profiler must be disabled. Set the following environment variables in your discourse distribution to disable it
+
+```
+DISCOURSE_LOAD_MINI_PROFILER=false
+DISABLE_MINI_PROFILER=true
+```

README.md

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+en:
+  site_settings:
+    discourse_plugin_elastic_apm: "Enable or disable the Elastic APM integration."
+    elastic_apm_service_name: "Name of the service for Elastic APM."
+    elastic_apm_server_url: "URL of the Elastic APM server (leave blank for default)."
+    elastic_apm_secret_token: "Elastic APM server secret token (leave blank for default)."
+    elastic_apm_transaction_sample_rate: "Set the transaction sample rate for Elastic APM (value between 0.0 and 1.0)."
+    elastic_apm_log_level: "Set the log level for Elastic APM."

assets/javascripts/.gitkeep

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+plugins:
+  discourse_plugin_elastic_apm:
+    default: false
+    client: true
+    type: boolean
+  elastic_apm_service_name:
+    default: "Discourse"
+    type: text
+  elastic_apm_server_url:
+    default: "http://localhost:8200"
+    type: text
+  elastic_apm_secret_token:
+    default: ""
+    type: text
+  elastic_apm_transaction_sample_rate:
+    default: 1.0
+    type: float
+    min: 0.0
+    max: 1.0
+  elastic_apm_log_level:
+    default: debug
+    type: list
+    choices:
+      - debug
+      - info
+      - warn
+      - error