Prometheus format filter plugin

deploy/docker/Dockerfile

@@ -14,9 +14,10 @@ RUN apk add --no-cache --update --virtual .build-deps sudo build-base ruby-dev \
        && gem install snappy
 
 RUN gem install fluent-plugin-sumologic_output \
-       && gem install fluent-plugin-rewrite-tag-filter \
        && gem install fluent-plugin-carbon-v2 \
+       && gem install fluent-plugin-prometheus-format \
        && gem install fluent-plugin-datapoint \
+       && gem install fluent-plugin-rewrite-tag-filter \
        && gem install fluent-plugin-protobuf
 
 RUN gem sources --clear-all \

deploy/docker/Dockerfile-debian

@@ -19,6 +19,8 @@ RUN sudo gem install snappy
 RUN sudo gem install fluent-plugin-sumologic_output \
  && sudo gem install fluent-plugin-carbon-v2 \
  && sudo gem install fluent-plugin-datapoint \
+ && sudo gem install fluent-plugin-rewrite-tag-filter \
+ && sudo gem install fluent-plugin-prometheus-format \
  && sudo gem install fluent-plugin-probuf
 
 RUN sudo gem sources --clear-all \

deploy/docker/fluent.conf

@@ -4,6 +4,22 @@
   tag "dummy"
   dummy {"hello":"world"}
 </source>
+<source>
+  @type http
+  port 9888
+  <parse>
+    @type protobuf
+  </parse>
+</source>
+<match FOR_TEST_ONLY>
+  @type datapoint
+</match>
+<filter FOR_TEST_ONLY>
+  @type carbon_v2
+</filter>
+<filter FOR_TEST_ONLY>
+  @type prometheus_format
+</filter>
 <match **>
   @type stdout
 </match>

deploy/test/test_docker.rb

@@ -1,9 +1,8 @@
 require 'test/unit'
 
 class TestDocker < Test::Unit::TestCase
-  DOCKER_TAG = 'sumologic/kubernetes-fluentd'.freeze
   CONTAINER_NAME = 'test-container'.freeze
-  DUMMY_OUTPUT = '"hello":"world"'.freeze
+  DUMMY_OUTPUT = 'dummy: {"hello":"world"}'.freeze
 
   def setup
     system("docker rm -f #{CONTAINER_NAME}", out: File::NULL, err: File::NULL)
@@ -13,23 +12,27 @@ def teardown
     system("docker rm -f #{CONTAINER_NAME}", out: File::NULL, err: File::NULL)
   end
 
+  def docker_tag
+    ENV['DOCKER_TAG'].nil? ? 'sumologic/kubernetes-fluentd' : ENV['DOCKER_TAG']
+  end
+
   def test_docker_image_exist
     result = `docker images`
-    assert result.include?(DOCKER_TAG)
+    assert result.include?(docker_tag)
   end
 
   def test_docker_image_runnable
-    id = `docker run -d --rm --name #{CONTAINER_NAME} #{DOCKER_TAG}:latest`
+    id = `docker run -d --rm --name #{CONTAINER_NAME} #{docker_tag}:latest`
     assert !id.nil? && !id.empty?
-    [1..10].each do |i|
-      sleep 1
-      result = `docker ps --filter "name=#{CONTAINER_NAME}"`
-      assert(
-        result.include?(CONTAINER_NAME),
-        "container stopped after #{i} seconds"
-      )
-    end
+    sleep_time = 15
+    sleep sleep_time
+    result = `docker ps --filter "name=#{CONTAINER_NAME}"`
+    assert(
+      result.include?(CONTAINER_NAME),
+      "container stopped after #{sleep_time} seconds"
+    )
     logs = `docker logs #{CONTAINER_NAME}`
+    puts logs
     assert logs.include?(DUMMY_OUTPUT)
   end
 end

fluent-plugin-prometheus-format/Gemfile

@@ -0,0 +1,3 @@
+source "https://rubygems.org"
+
+gemspec

fluent-plugin-prometheus-format/README.md

@@ -0,0 +1,103 @@
+# fluent-plugin-prometheus-format
+
+[Fluentd](https://fluentd.org/) filter plugin to transform data points to prometheus format.
+
+- All fields of the metric will be serialized as intrinsic tags (dimensions) in the prometheus format.
+- Sample of Input
+
+```json
+{
+    "endpoint": "http-metrics",
+    "handler": "prometheus",
+    "instance": "172.20.36.191:10251",
+    "job": "kube-scheduler",
+    "namespace": "kube-system",
+    "kubernetes": {
+        "pod": {
+            "name": "kube-scheduler-ip-172-20-36-191.us-west-1.compute.internal"
+        },
+        "service": {
+            "name": "kube-scheduler"
+        }
+    },
+    "prometheus": "monitoring/prometheus-operator-prometheus",
+    "prometheus_replica": "prometheus-prometheus-operator-prometheus-0",
+    "service": "prometheus-operator-kube-scheduler",
+    "@metric": "http_request_size_bytes_sum",
+    "@timestamp": 1550862304339,
+    "@value": 1619905.0
+}
+```
+
+- Sample of Output
+
+```json
+{
+    "message": "http_request_size_bytes_sum{endpoint=\"http-metrics\",handler=\"prometheus\",instance=\"172.20.36.191:10251\",job=\"kube-scheduler\",kubernetes.pod.name=\"kube-scheduler-ip-172-20-36-191.us-west-1.compute.internal\",kubernetes.service.name=\"kube-scheduler\",namespace=\"kube-system\",prometheus=\"monitoring/prometheus-operator-prometheus\",prometheus_replica=\"prometheus-prometheus-operator-prometheus-0\",service=\"prometheus-operator-kube-scheduler\",_origin=\"kubernetes\"} 1619905.0 1550862304339"
+}
+```
+
+## Installation
+
+### RubyGems
+
+```sh
+gem install fluent-plugin-prometheus-format
+```
+
+### Bundler
+
+Add following line to your Gemfile:
+
+```ruby
+gem "fluent-plugin-prometheus-format"
+```
+
+And then execute:
+
+```sh
+bundle
+```
+
+## Configuration
+
+### relabel (hash) (optional)
+
+Relabel the field name in the input record.
+For every (`key`, `value`) pair in the hash, the field named with `key` in the input record will be relabeled to `value`.
+If `key` is not a field in the input record, it will be ignored.
+If `value` is an empty string, the field will be removed from the record.
+
+Default value: `{}`.
+
+### inclusions (hash) (optional)
+
+Whitelist of the records with regular expression matching on the field(s).
+For __all__ (`key`, `value`) pairs in the hash, only following records will be included in the output:
+
+- the value of field named with `key` matches the `value` (as regular expression).
+
+Default value: `{}`.
+
+### strict_inclusions (bool) (optional)
+
+If `true`, records missing any field in keys of `inclusions` will be dropped.
+
+Default value: `false`
+
+### exclusions (hash) (optional)
+
+Blacklist of the records with regular expression matching on the field(s).
+For __any__ (`key`, `value`) pair in the hash, following records will be excluded in the output:
+
+- the value of field named with `key` matches the `value` (as regular expression).
+
+Default value: `{}`.
+
+### strict_exclusions (bool) (optional)
+
+If `true`, records missing any field in keys of `exclusions` will be dropped.
+
+Default value: `false`
+
+__NOTE__ inclusions/exclusions rules are applied after relabeling and flatten.

fluent-plugin-prometheus-format/Rakefile

@@ -0,0 +1,13 @@
+require "bundler"
+Bundler::GemHelper.install_tasks
+
+require "rake/testtask"
+
+Rake::TestTask.new(:test) do |t|
+  t.libs.push("lib", "test")
+  t.test_files = FileList["test/**/test_*.rb"]
+  t.verbose = true
+  t.warning = true
+end
+
+task default: [:test]

fluent-plugin-prometheus-format/fluent-plugin-prometheus-format.gemspec

@@ -0,0 +1,26 @@
+lib = File.expand_path("../lib", __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+
+Gem::Specification.new do |spec|
+  spec.name    = "fluent-plugin-prometheus-format"
+  spec.version = "0.0.0"
+  spec.authors = ["Sumo Logic"]
+  spec.email   = ["collection@sumologic.com"]
+
+  spec.summary       = %q{Fluentd plugin for transfer data points to prometheus metrics format.}
+  spec.homepage      = "https://github.com/SumoLogic/sumologic-kubernetes-collection"
+  spec.license       = "Apache-2.0"
+
+  test_files, files  = `git ls-files -z`.split("\x0").partition do |f|
+    f.match(%r{^(test|spec|features)/})
+  end
+  spec.files         = files
+  spec.executables   = files.grep(%r{^bin/}) { |f| File.basename(f) }
+  spec.test_files    = test_files
+  spec.require_paths = ["lib"]
+
+  spec.add_development_dependency "bundler", "~> 2.0"
+  spec.add_development_dependency "rake", "~> 12.0"
+  spec.add_development_dependency "test-unit", "~> 3.0"
+  spec.add_runtime_dependency "fluentd", [">= 0.14.10", "< 2"]
+end