code: public Note createIssueNote(Object projectIdOrPath, Integer issueIid, String body, Date createdAt) throws GitLabApiException {
  
          GitLabApiForm formData = new GitLabApiForm()
                  .withParam("body", body, true)
                  .withParam("created_at", createdAt);
          Response response = post(Response.Status.CREATED, formData,
                  "projects", getProjectIdOrPath(projectIdOrPath), "issues", issueIid, "notes");
          return (response.readEntity(Note.class));
      }
docs: Create a issues's note.
  
  @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
  @param issueIid the issue IID to create the notes for
  @param body the content of note
  @param createdAt the created time of note
  @return the created Note instance
  @throws GitLabApiException if any exception occurs