This code system http://hl7.org/fhir/metric-operational-status defines the following codes:

Code Display Definition
on On The DeviceMetric is operating and will generate Observations.
off Off The DeviceMetric is not operating.
standby Standby The DeviceMetric is operating, but will not generate any Observations.
entered-in-error Entered In Error The DeviceMetric was entered in error.
<status value="active"/> <experimental value="false"/> <date value="2021-01-05T10:01:24+11:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="Describes the operational status of the DeviceMetric."/> <jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> <display value="World"/> </coding> </jurisdiction> <caseSensitive value="true"/> <valueSet value="http://hl7.org/fhir/ValueSet/metric-operational-status"/> <content value="complete"/> <concept> <code value="on"/> <display value="On"/> <definition value="The DeviceMetric is operating and will generate Observations."/> </concept> <concept> <code value="off"/> <display value="Off"/> <definition value="The DeviceMetric is not operating."/> </concept> <concept> <code value="standby"/> <display value="Standby"/> <definition value="The DeviceMetric is operating, but will not generate any Observations."/> </concept> <concept> <code value="entered-in-error"/> <display value="Entered In Error"/> <definition value="The DeviceMetric was entered in error."/> </concept> </CodeSystem>