docs: def get_environment(self):
          """
          Get environment facts.
  
          power and fan are currently not implemented
          cpu is using 1-minute average
          """
  
          environment = {}
          # sys_resources contains cpu and mem output
          sys_resources = self._send_command("show system resources")
          temp_cmd = "show environment temperature"
  
          # cpu
          environment.setdefault("cpu", {})
          environment["cpu"]["0"] = {}
          environment["cpu"]["0"]["%usage"] = -1.0
          system_resources_cpu = helpers.textfsm_extractor(
              self, "system_resources", sys_resources
          )
          for cpu in system_resources_cpu:
              cpu_dict = {
                  cpu.get("cpu_id"): {
                      "%usage": round(100 - float(cpu.get("cpu_idle")), 2)
                  }
              }
              environment["cpu"].update(cpu_dict)
  
          # memory
          environment.setdefault("memory", {})
          for line in sys_resources.splitlines():
              # Memory usage:   16401224K total,   4798280K used,   11602944K free
              if "Memory usage:" in line:
                  proc_total_mem, proc_used_mem, _ = line.split(",")
                  proc_used_mem = re.search(r"\d+", proc_used_mem).group(0)
                  proc_total_mem = re.search(r"\d+", proc_total_mem).group(0)
                  break
          else:
              raise ValueError("Unexpected output from: {}".format(line))
          environment["memory"]["used_ram"] = int(proc_used_mem)
          environment["memory"]["available_ram"] = int(proc_total_mem)
  
          # temperature
          output = self._send_command(temp_cmd)
          environment.setdefault("temperature", {})
          for line in output.splitlines():
              # Module   Sensor        MajorThresh   MinorThres   CurTemp     Status
              # 1        Intake          70              42          28         Ok
              if re.match(r"^[0-9]", line):
                  module, sensor, is_critical, is_alert, temp, _ = line.split()
                  is_critical = float(is_critical)
                  is_alert = float(is_alert)
                  temp = float(temp)
                  env_value = {
                      "is_alert": temp >= is_alert,
                      "is_critical": temp >= is_critical,
                      "temperature": temp,
                  }
                  location = "{0}-{1}".format(sensor, module)
                  environment["temperature"][location] = env_value
  
          # Initialize 'power' and 'fan' to default values (not implemented)
          environment.setdefault("power", {})
          environment["power"]["invalid"] = {
              "status": True,
              "output": -1.0,
              "capacity": -1.0,
          }
          environment.setdefault("fans", {})
          environment["fans"]["invalid"] = {"status": True}
  
          return environment