Make max file count configurable in the directory check

[nicholas-devlin]

What does this PR do?

makes max_filegauge_count an undocumented configurable setting

Motivation

I wanted to monitor more than 20 files and expected this setting to be configureable like in our rabbitmq check and the jmx fetch based integrations

Additional Notes

I'm not sure if any unit tests or things also need to be updated, just let me know if so.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached

[ofek]

Nice! Let's fix up title, etc. https://datadoghq.dev/integrations-core/guidelines/pr/

[nicholas-devlin]

thanks for the reviews! I updated the PR title, and updated the reference to that max constant

[ChristineTChen]

@nicholas-devlin looks good to me, I'm ready to ✅ . CI is failing because of style. Please run ddev test directory -fs and commit the changes.

[codecov]

Codecov Report

Merging #6847 into master will increase coverage by 5.35%.
The diff coverage is 100.00%.

Impacted Files	Coverage Δ
directory/datadog_checks/directory/directory.py	92.59% <100.00%> (+0.09%)	⬆️
ceph/tests/test_unit.py
mesos_master/tests/test_integration_e2e.py
apache/datadog_checks/apache/__about__.py
cassandra/tests/common.py
jboss_wildfly/tests/common.py
hdfs_namenode/tests/conftest.py
datadog_checks_base/tests/test_agent_check.py
postfix/datadog_checks/postfix/__about__.py
couchbase/tests/test_unit.py
... and 841 more

[nicholas-devlin]

I couldn't figure out how to run that command:

$ ddev test directory -fs
Code formatting is not enabled!
To enabled it, put `dd_check_style = true` under the `[testenv]` section of `tox.ini`.

nothing seems to happen when i run the test without the directory check specified, either. Maybe it isn't detecting that there are changes to the file compared to master?

$ ddev test
Nothing to test!

I don't really understand the error that the docs / build check is giving me: https://github.com/DataDog/integrations-core/pull/6847/checks?check_run_id=751798110

[ofek]

mkdocstrings/pytkdocs#43

[ofek]

@nicholas-devlin Show ddev --version