text: Source Tags
  Tag all subsequent outgoing pings with a maximum of 5 comma-separated tags.
  "To tag" a ping with Source Tags means that the ping request
  will contain the
  X-Source-Tags header with a comma separated list of the given tags.
  Once enabled, the only way to disable this feature is to restart or manually reset the application.
  Limits
  - Any valid HTTP header value is a valid source tag (e.g. any value that matches the regex
  [a-zA-Z0-9-]{1,20}) and values starting with the substring
  gleanare reserved for internal Glean usage and thus are also considered invalid. If any value in the list of source tags is invalid, the whole list will be ignored.
  - If the list of tags has more than five members, the whole list will be ignored.
  - The special value
  automationis meant for tagging pings generated on automation: such pings will be specially handled on the pipeline (i.e. discarded from non-live views).
  API
  setSourceTags
  Sets the Source Tags to a given value.
  This API can safely be called before
  Glean.initialize.
  The tag will be applied upon initialization in this case.
  import mozilla.telemetry.glean.Glean Glean.setSourceTags(setOf("my-tag", "your-tag", "our-tag"))
  Glean.INSTANCE.setSourceTags(setOf("my-tag", "your-tag", "our-tag"))
  import Glean Glean.shared.setSourceTags(["my-tag", "your-tag", "our-tag"])
  use glean; glean.set_source_tags(["my-tag", "your-tag", "our-tag"]);
  import Glean from "@mozilla/glean/<platform>"; Glean.setSourceTags(["my-tag", "your-tag", "our-tag"]);
  Environment variable
  GLEAN_SOURCE_TAGS
  It is also possible to set the debug view tag through
  the
  GLEAN_SOURCE_TAGS_SOURCE_TAGS=my-tag,your-tag,our-tag python my_application.py
  $ GLEAN_SOURCE_TAGS=my-tag,your-tag,our-tag cargo run
  $ GLEAN_SOURCE_TAGS=my-tag,your-tag,our-tag ./mach run