Add IPv6 support to DD_AGENT_HOST

[bwoebi]

Description

Fixes #1667.

Readiness checklist

• (only for Members) Changelog has been added to the release document.
• Tests added for this feature/bug.

Reviewer checklist

• Appropriate labels assigned.
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[NickStallman]

I just noticed I wasn't getting APM logs, and I found this in the phpinfo() logs:

{
  "date": "2022-11-08T01:55:34Z",
  "os_name": "Linux app-7fc989d984-6pddh 5.4.196-108.356.amzn2.x86_64 #1 SMP Thu May 26 12:49:47 UTC 2022 x86_64",
  "os_version": "5.4.196-108.356.amzn2.x86_64",
  "version": "0.81.1",
  "lang": "php",
  "lang_version": "7.4.30",
  "env": "produk",
  "enabled": true,
  "service": "app",
  "enabled_cli": false,
  "agent_url": "http://2a05:d01c:0000:0000:0000:0000:44d5:56b0:8126",
  "debug": false,
  "analytics_enabled": false,
  "sample_rate": 1,
  "sampling_rules": [],
  "tags": [],
  "service_mapping": [],
  "distributed_tracing_enabled": true,
  "priority_sampling_enabled": true,
  "dd_version": "27c7ce36",
  "architecture": "x86_64",
  "sapi": "apache2handler",
  "datadog.trace.request_init_hook": "/opt/datadog-php/dd-trace-sources/bridge/dd_wrap_autoloader.php",
  "open_basedir_configured": false,
  "uri_fragment_regex": null,
  "uri_mapping_incoming": null,
  "uri_mapping_outgoing": null,
  "auto_flush_enabled": false,
  "generate_root_span": true,
  "http_client_split_by_domain": true,
  "measure_compile_time": true,
  "report_hostname_on_root_span": false,
  "traced_internal_functions": null,
  "auto_prepend_file_configured": false,
  "integrations_disabled": "default",
  "enabled_from_env": true,
  "opcache.file_cache": null,
  "agent_error": "URL using bad/illegal format or missing URL"
}

datadog.agent_host is set to 2a05:d01c:0000:0000:0000:0000:44d5:56b0

So the URL isn't being formatted correctly, even after this patch? I verified with the latest 0.81.1 as well.

[bwoebi]

@NickStallman Note that this patch wasn't merged. We still want to, but we need to update the profiler too (using the same configs). I haven't gotten to it yet.

[NickStallman]

Ahh I just noticed that. It'll be good once it's merged as right now I can't (very easily) use APM on a new Kubernetes cluster. Thanks

[realFlowControl]

I added some tests for the detect_uri_from_config() function in the profiler.
LGTM 🚀