Cherry-pick #19944 to 7.x: Infer types in Prometheus remote_write

[ChrsMark]

Cherry-pick of PR #19944 to 7.x branch. Original message:

This PR add types for Prometheus metrics that are collected via remote_write metricset.
These metrics are in raw format when received so a heuristic approach is applied to extract types from metrics' name patterns.

Closes #17675.

TODOs

• Implementation
• Tests
• Update docs

How to test this PR

Env setup

Use https://github.com/ChrsMark/docker-prometheus-playground for a ready to use prometheus env.
For remote write this config is needed: https://github.com/ChrsMark/docker-prometheus-playground/blob/master/prometheus/prometheus.yml#L10
If using a darwin machine the following should be enough:

remote_write:
- url: "http://host.docker.internal:9201/write"

On linux machines in order to access host from within the Prometheus container one can set network_mode: host in the docker-compose.yml and then host can be reach using 0.0.0.0.

Testing

1. Use oss version and test collector and remote_write (without types) metricsets for regressions.
2. Use basic version and test collector (with types) for regressions.
3. Use basic version and test that remote_write metricset:
   a. uses types as expected.
   b. can identify types based on input patterns: https://github.com/elastic/beats/pull/19944/files?file-filters%5B%5D=.asciidoc#diff-b69e84fad87eb2ae563115f43675a547R118

[elasticmachine]

Pinging @elastic/integrations-platforms (Team:Platforms)

[elasticmachine]

💔 Tests Failed

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Build stats

• Build Cause: [Pull request #20314 opened]

• Start Time: 2020-07-29T13:20:31.410+0000

• Duration: 60 min 20 sec

Test stats 🧪

Test	Results
Failed	1
Passed	2918
Skipped	674
Total	3593

Test errors

Expand to view the tests failures

• Name: Build and Test / Metricbeat OSS Unit tests / test_process – test_system.Test

  • Age: 1
  • Duration: 1.337
  • Error Details: False is not true : fd not found in any process events

Steps errors

Expand to view the steps failures

• Name: Mage build unitTest

  • Description: mage build unitTest

  • Duration: 9 min 3 sec

  • Start Time: 2020-07-29T13:47:05.472+0000

  • log

Log output

Expand to view the last 100 lines of log output

[2020-07-29T14:20:02.157Z] + tar --exclude=x-pack-metricbeat--system-tests-darwin.tgz -czf x-pack-metricbeat--system-tests-darwin.tgz build/x-pack/metricbeat/build/system-tests
[2020-07-29T14:20:02.369Z] Archiving artifacts
[2020-07-29T14:20:03.678Z] + .ci/scripts/report-codecov.sh auditbeat filebeat heartbeat journalbeat libbeat metricbeat packetbeat winlogbeat
[2020-07-29T14:20:03.678Z] + CODECOV_URL=https://codecov.io/bash
[2020-07-29T14:20:03.678Z] + '[' -e /usr/local/bin/bash_standard_lib.sh ']'
[2020-07-29T14:20:03.678Z] + curl -sSLo codecov https://codecov.io/bash
[2020-07-29T14:20:04.126Z] + for i in '"$@"'
[2020-07-29T14:20:04.126Z] + FILE=auditbeat/build/coverage/full.cov
[2020-07-29T14:20:04.126Z] + '[' -f auditbeat/build/coverage/full.cov ']'
[2020-07-29T14:20:04.126Z] + for i in '"$@"'
[2020-07-29T14:20:04.126Z] + FILE=filebeat/build/coverage/full.cov
[2020-07-29T14:20:04.126Z] + '[' -f filebeat/build/coverage/full.cov ']'
[2020-07-29T14:20:04.126Z] + for i in '"$@"'
[2020-07-29T14:20:04.126Z] + FILE=heartbeat/build/coverage/full.cov
[2020-07-29T14:20:04.126Z] + '[' -f heartbeat/build/coverage/full.cov ']'
[2020-07-29T14:20:04.126Z] + for i in '"$@"'
[2020-07-29T14:20:04.126Z] + FILE=journalbeat/build/coverage/full.cov
[2020-07-29T14:20:04.126Z] + '[' -f journalbeat/build/coverage/full.cov ']'
[2020-07-29T14:20:04.126Z] + for i in '"$@"'
[2020-07-29T14:20:04.126Z] + FILE=libbeat/build/coverage/full.cov
[2020-07-29T14:20:04.126Z] + '[' -f libbeat/build/coverage/full.cov ']'
[2020-07-29T14:20:04.126Z] + for i in '"$@"'
[2020-07-29T14:20:04.126Z] + FILE=metricbeat/build/coverage/full.cov
[2020-07-29T14:20:04.126Z] + '[' -f metricbeat/build/coverage/full.cov ']'
[2020-07-29T14:20:04.126Z] + for i in '"$@"'
[2020-07-29T14:20:04.126Z] + FILE=packetbeat/build/coverage/full.cov
[2020-07-29T14:20:04.126Z] + '[' -f packetbeat/build/coverage/full.cov ']'
[2020-07-29T14:20:04.126Z] + for i in '"$@"'
[2020-07-29T14:20:04.126Z] + FILE=winlogbeat/build/coverage/full.cov
[2020-07-29T14:20:04.126Z] + '[' -f winlogbeat/build/coverage/full.cov ']'
[2020-07-29T14:20:05.625Z] Post stage
[2020-07-29T14:20:05.644Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats
[2020-07-29T14:20:06.498Z] Starting "default"...
[2020-07-29T14:20:06.498Z] Machine "default" is already running.
[2020-07-29T14:20:08.625Z] Error checking TLS connection: Error checking and/or regenerating the certs: There was an error validating certificates for host "192.168.99.101:2376": dial tcp 192.168.99.101:2376: connect: connection refused
[2020-07-29T14:20:08.625Z] You can attempt to regenerate them using 'docker-machine regenerate-certs [name]'.
[2020-07-29T14:20:08.625Z] Be advised that this will trigger a Docker daemon restart which might stop running containers.
[2020-07-29T14:20:08.625Z] 
[2020-07-29T14:20:08.625Z] Client: Docker Engine - Community
[2020-07-29T14:20:08.625Z]  Version:           19.03.1
[2020-07-29T14:20:08.625Z]  API version:       1.40
[2020-07-29T14:20:08.625Z]  Go version:        go1.12.5
[2020-07-29T14:20:08.625Z]  Git commit:        74b1e89
[2020-07-29T14:20:08.625Z]  Built:             Thu Jul 25 21:18:17 2019
[2020-07-29T14:20:08.625Z]  OS/Arch:           darwin/amd64
[2020-07-29T14:20:08.625Z]  Experimental:      false
[2020-07-29T14:20:08.625Z] Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
[2020-07-29T14:20:08.625Z] It requires Docker daemon to be installed and running
[2020-07-29T14:20:26.054Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats
[2020-07-29T14:20:26.394Z] + find . -type f -name TEST*.xml -path */build/* -delete
[2020-07-29T14:20:26.424Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats/Lint
[2020-07-29T14:20:26.605Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats/Metricbeat-OSS-Go-Integration-tests
[2020-07-29T14:20:26.775Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats/Metricbeat-OSS-Python-Integration-tests
[2020-07-29T14:20:26.936Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats/Metricbeat-OSS-Unit-tests
[2020-07-29T14:20:27.089Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats/Metricbeat-crosscompile
[2020-07-29T14:20:27.242Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats/Metricbeat-x-pack
[2020-07-29T14:20:27.407Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats/Metricbeat-Windows
[2020-07-29T14:20:27.708Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats/Metricbeat-x-pack-Windows
[2020-07-29T14:20:27.980Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats/Metricbeat-Mac-OS-X
[2020-07-29T14:20:28.275Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats/Metricbeat-x-pack-Mac-OS-X
[2020-07-29T14:20:29.163Z] + cat
[2020-07-29T14:20:29.164Z] + /usr/local/bin/runbld ./runbld-script
[2020-07-29T14:20:29.164Z] Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8
[2020-07-29T14:20:35.776Z] runbld>>> runbld started
[2020-07-29T14:20:35.776Z] runbld>>> 1.6.12/f45d832f2ba0aa2722ab4ec1fda8ad140f027f8b
[2020-07-29T14:20:37.835Z] runbld>>> The following profiles matched the job 'Beats/beats/PR-20314' in order of occurrence in the config (last value wins).
[2020-07-29T14:20:39.228Z] runbld>>> Debug logging enabled.
[2020-07-29T14:20:39.228Z] runbld>>> Storing result
[2020-07-29T14:20:39.228Z] runbld>>> Store result: created {:total 2, :successful 2, :failed 0} 1
[2020-07-29T14:20:39.228Z] runbld>>> BUILD: https://c150076387b5421f9154dfbf536e5c60.us-west1.gcp.cloud.es.io:9243/build-1587637540455/t/20200729142038-F1E6D1E7
[2020-07-29T14:20:39.228Z] runbld>>> Adding system facts.
[2020-07-29T14:20:40.618Z] runbld>>> Adding vcs info for the latest commit:  823346b22fe9713565fde11321bc1cd3e28845f0
[2020-07-29T14:20:40.618Z] runbld>>> >>>>>>>>>>>> SCRIPT EXECUTION BEGIN >>>>>>>>>>>>
[2020-07-29T14:20:40.618Z] runbld>>> Adding /usr/lib/jvm/java-8-openjdk-amd64/bin to the path.
[2020-07-29T14:20:40.618Z] + echo 'Processing JUnit reports with runbld...'
[2020-07-29T14:20:40.619Z] Processing JUnit reports with runbld...
[2020-07-29T14:20:40.880Z] runbld>>> <<<<<<<<<<<< SCRIPT EXECUTION END <<<<<<<<<<<<
[2020-07-29T14:20:40.880Z] runbld>>> DURATION: 39ms
[2020-07-29T14:20:40.880Z] runbld>>> STDOUT: 40 bytes
[2020-07-29T14:20:40.880Z] runbld>>> STDERR: 49 bytes
[2020-07-29T14:20:40.880Z] runbld>>> WRAPPED PROCESS: SUCCESS (0)
[2020-07-29T14:20:40.880Z] runbld>>> Searching for build metadata in /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats
[2020-07-29T14:20:41.825Z] runbld>>> Storing build metadata: 
[2020-07-29T14:20:41.825Z] runbld>>> Adding test report.
[2020-07-29T14:20:41.825Z] runbld>>> Searching for junit test output files with the pattern: TEST-.*\.xml$ in: /var/lib/jenkins/workspace/Beats_beats_PR-20314/src/github.com/elastic/beats
[2020-07-29T14:20:42.770Z] runbld>>> Found 15 test output files
[2020-07-29T14:20:43.713Z] runbld>>> Test output logs contained: Errors: 0 Failures: 1 Tests: 3593 Skipped: 597
[2020-07-29T14:20:43.994Z] runbld>>> Storing result
[2020-07-29T14:20:43.994Z] runbld>>> FAILURES: 1
[2020-07-29T14:20:44.256Z] runbld>>> Store result: updated {:total 2, :successful 2, :failed 0} 2
[2020-07-29T14:20:44.256Z] runbld>>> BUILD: https://c150076387b5421f9154dfbf536e5c60.us-west1.gcp.cloud.es.io:9243/build-1587637540455/t/20200729142038-F1E6D1E7
[2020-07-29T14:20:44.517Z] runbld>>> Email notification disabled by environment variable.
[2020-07-29T14:20:44.517Z] runbld>>> Slack notification disabled by environment variable.
[2020-07-29T14:20:50.135Z] Running on Jenkins in /var/lib/jenkins/workspace/Beats_beats_PR-20314
[2020-07-29T14:20:50.323Z] [INFO] getVaultSecret: Getting secrets
[2020-07-29T14:20:50.403Z] Masking supported pattern matches of $VAULT_ADDR or $VAULT_ROLE_ID or $VAULT_SECRET_ID
[2020-07-29T14:20:51.467Z] + chmod 755 generate-build-data.sh
[2020-07-29T14:20:51.467Z] + ./generate-build-data.sh https://beats-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/Beats/beats/PR-20314/ https://beats-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/Beats/beats/PR-20314/runs/1 FAILURE 3619786
[2020-07-29T14:20:51.467Z] INFO: curl https://beats-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/Beats/beats/PR-20314/runs/1/steps/?limit=10000 -o steps-info.json
[2020-07-29T14:20:52.378Z] INFO: curl https://beats-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/Beats/beats/PR-20314/runs/1/tests/?status=FAILED -o tests-errors.json