---
name: University of Michigan-Ann Arbor — API Lifecycle
generated: '2026-08-19'
method: probed
source: Live probes of U-M hosts, 2026-08-19
operator: institution
summary: >-
  No API lifecycle policy — versioning scheme, deprecation notice period, sunset commitment,
  changelog or status page — was found for any institution-operated University of Michigan API
  surface. This is recorded as an absence that was looked for, not as an unexamined blank.
versioning:
  scheme: protocol-versioned
  detail: >-
    The Deep Blue Documents endpoint declares protocolVersion 2.0 in its Identify response.
    That is the OAI-PMH protocol version, not a University of Michigan API version — U-M does
    not version this surface itself. No version is carried in the path, in a header, or in a
    media type.
  evidence: '<protocolVersion>2.0</protocolVersion> in the live Identify response'
deprecation:
  policy_published: false
  sunset_header: false
  deprecation_header: false
  detail: >-
    No RFC 8594 Sunset header and no Deprecation header were observed on any OAI-PMH response.
    No deprecation policy document was found on a readable U-M host.
changelog:
  published: false
  detail: >-
    No changelog for any U-M API surface was found. U-M ITS publishes service news at
    michigan.it.umich.edu — that is where the 2024 migration of the API Directory from IBM API
    Connect v5 to Google Apigee X was announced — but it is IT service news, not an API
    changelog, and it is not machine-readable.
status_page:
  published: true
  operator: institution
  url: https://status.its.umich.edu
  machine_readable: false
  detail: >-
    U-M ITS runs a service status page. No JSON status endpoint was found and the host is
    behind the same bot challenge as the rest of the umich.edu estate, so its availability
    could not be verified anonymously; recorded as a claim to re-probe, not a verified pointer.
    Not emitted as an apis.yml pointer for that reason.
stability_signal:
  detail: >-
    The one hard stability signal available is the repository's own record of itself: the Deep
    Blue OAI-PMH earliestDatestamp is 2005-08-29T23:07:21Z, so this harvesting surface has been
    accumulating records for twenty-one years. Continuity is evidenced by operation, not by
    policy.