Promtail: Add 'country' to geoip pipeline-stage

[superstes]

What this PR does / why we need it:

Maxmind provides multiple GeoIP2 databases.
The three most used ones are City, Country and ASN as they are also available as free GeoLiteIP2 databases.

Some users might want/need to use the 'Country' database - so I added support for it.
A reason: If the user only has the 'Country' database licensed.

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• CHANGELOG.md updated
  Skipped because it's a simple enhancement

[CLAassistant]

All committers have signed the CLA.

[github-actions]

Trivy scan found the following vulnerabilities:

• HIGH openssl: Incorrect cipher key and IV length processing in libcrypto3 v3.1.3-r0. Fixed in v3.1.4-r0
• HIGH openssl: Incorrect cipher key and IV length processing in libssl3 v3.1.3-r0. Fixed in v3.1.4-r0

[superstes]

Note: Also related to the fix of PR #10256

[superstes]

I've now also added database-specific tests.

To note: The minimal (1 record) testdata-databases are added for the sake of simplicity.

One could also:

• add the mmdbwriter as (test-)dependency and build those database-binaries at test-runtime from JSON
• or download the maxmind testdata on each test-run

[cstyan]

Hello @superstes , thanks for your PR.

We're currently reevaluating promtails position as a project within Grafana Labs. Internally we're actually using the Agent for both metrics and logs collection at this point. Additionally, the agent team is more likely to have time to dedicate to your PR.

While we haven't made a formal decision yet, we expect in the near future that all new feature work will be done in the Agent's log collection pipelines rather than in Promtail.

[superstes]

@cstyan Thanks for information.
Is there any public discussion regarding this promtail/agent topic?
I would be interested in it as I'm currently implenting a Syslog => Promtail => Loki <= Grafana solution in one of my projects.

[cstyan]

@superstes public discussion in what sense?

I'll also point out that the agent has a hard fork of promtail code, so you can likely make a very similar improvement there: https://github.com/grafana/agent/blob/b7f7c57a9420af409508eb3acc5618371b3f8107/component/loki/process/stages/geoip.go

[superstes]

@cstyan 'Discussion' might've been the wrong word.
I meant: 'Where could one ask questions regarding the comparison/overlap of grafana-agent and promtail?'

Per example:

• I would guess grafana-agent does not (yet) implement all functionality of promtail, or does it?
• How to 'translate/port' specific promtail setups/config to grafana-agent

[JStickler]

There should be feature parity because the Agent team took a fork of Promtail back in March 2023 and incorporated it into Grafana Agent. We’re just starting the process of trying to point requests for new features to grafana/agent.
https://grafana.com/docs/agent/latest/flow/getting-started/migrating-from-promtail/

[superstes]

@JStickler Thank you for the information.
Then I'll take the time and migrate my setup to the agent and create a PR at the grafana/agent repository.

[cstyan]

closing since it looks like your agent pr was merged, thanks for your time @superstes we appreciate it :)