Project.MilestoneMilestone operates on a Project's milestones. There is a separate Group Milestone module.
val milestones : 
  ?token:Token.t ->
  project_id:int ->
  ?state:Gitlab_t.milestone_state ->
  ?title:string ->
  ?search:string ->
  unit ->
  Gitlab_t.milestones Response.t Monad.tmilestones ~project_id returns a list of project milestones.
val milestone : 
  ?token:Token.t ->
  project_id:int ->
  milestone_id:int ->
  unit ->
  Gitlab_t.milestone Response.t Monad.tmilestone ~project_id ~milestone_id get a single project milestone.
val create : 
  token:Token.t ->
  project_id:int ->
  Gitlab_t.new_milestone ->
  unit ->
  Gitlab_t.milestone Response.t Monad.tcreate ~project_id ~title create a project milestone.
val update : 
  token:Token.t ->
  project_id:int ->
  milestone_id:int ->
  ?title:string ->
  ?description:string ->
  ?due_date:string ->
  ?start_date:string ->
  ?state_event:Gitlab_t.milestone_state ->
  unit ->
  Gitlab_t.milestone Response.t Monad.tupdate ~project_id ~milestone_id update an existing milestone.
See Edit a milestone.
val delete : 
  token:Token.t ->
  project_id:int ->
  milestone_id:int ->
  unit ->
  unit Response.t Monad.tdelete ~project_id ~milestone_id delete a project milestone.
See Delete a milestone.