5 threads (for the default singleton) can be created even when SlackConfig#statsEnabled is false

Developers can disable API clients' metrics management by setting SlackConfig#statsEnabled to false. Even in this case, the default SlackConfig object creation (as a static field in the class) starts 5 threads and those threads are unused. See the repro steps below for details.

Reproducible in:

any versions

The Slack SDK version

any versions

Java Runtime version

any versions

OS info

any versions

Steps to reproduce:

Running the following code and checking the thread dump.

SlackConfig config = new SlackConfig();
config.setStatsEnabled(false);
Slack slack = Slack.getInstance(config);

Expected result:

No threads under a "slack-api-metrics" thread group are created.

Actual result:

5 threads for the default singleton SlackConfig instance are created.