ðiːz mˈɑːnɪɾɚɹɪŋ sˈɪstəmz ɑːɹ ˈɔfən jˈuːzd tə kˈiːp tɹˈæk ʌv sˈɪstəm ɹᵻsˈoːɹsᵻz, sˈʌtʃ ɐz sˌiːpˌiːjˈuː jˈuːsɪdʒ ænd fɹˈiːkwənsi, ɔːɹ ðɪ ɐmˈaʊnt ʌv fɹˈiː ˌɑːɹɹˌeɪˈɛm.
These monitoring systems are often used to keep track of system resources, such as CPU usage and frequency, or the amount of free RAM.