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

CodeDisplayDefinition
active ActiveThis endpoint is expected to be active and can be used.
suspended SuspendedThis endpoint is temporarily unavailable.
error ErrorThis endpoint has exceeded connectivity thresholds and is considered in an error state and should no longer be attempted to connect to until corrective action is taken.
off OffThis endpoint is no longer to be used.
entered-in-error Entered in errorThis instance should not have been part of this patient's medical record.
<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="The status of the endpoint."/><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/endpoint-status"/><content value="complete"/><concept><code value="active"/><display value="Active"/><definition value="This endpoint is expected to be active and can be used."/></concept><concept><code value="suspended"/><display value="Suspended"/><definition value="This endpoint is temporarily unavailable."/></concept><concept><code value="error"/><display value="Error"/><definition value="This endpoint has exceeded connectivity thresholds and is considered in an error state and should no longer be attempted to connect to until corrective action is taken."/></concept><concept><code value="off"/><display value="Off"/><definition value="This endpoint is no longer to be used."/></concept><concept><code value="entered-in-error"/><display value="Entered in error"/><definition value="This instance should not have been part of this patient's medical record."/></concept></CodeSystem>