You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: checkmgr.go
    path of file: ./repos/fabio/vendor/github.com/circonus-labs/circonus-gometrics/v3/checkmgr
    
    the code of the file until where you have to start completion: // Copyright 2016 Circonus, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package checkmgr provides a check management interface to circonus-gometrics
package checkmgr

import (
	"crypto/tls"
	"crypto/x509"
	"fmt"
	"io/ioutil"
	"log"
	"net/url"
	"os"
	"path"
	"regexp"
	"strconv"
	"strings"
	"sync"
	"time"

	apiclient "github.com/circonus-labs/go-apiclient"
	"github.com/pkg/errors"
	"github.com/tv42/httpunix"
)

// Check management offers:
//
// Create a chec
    
func (cm *CheckManager) Initialize() {

	// if not managing the check, quicker initialization
	if !cm.enabled {
		err := cm.initializeTrapURL()
		if err == nil {
			cm.initializedmu.Lock()
			cm.initialized = true
			cm.initializedmu.Unlock()
		} else {
			cm.Log.Printf("error initializing trap %s", err.Error())
		}
		return
	}

	// background initialization when we have to reach out to the api
	go func() {
		cm.apih.EnableExponentialBackoff()
		err := cm.initializeTrapURL()
		if err == nil {
			cm.initializedmu.Lock()
			cm.initialized = true
			cm.initializedmu.Unlock()
		} else {
			cm.Log.Printf("error initializing trap %s", err.Error())
		}
		cm.apih.DisableExponentialBackoff()
	}()
}