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Drop clusters_applications_prometheus table

Hunter Stewart requested to merge hustewart-drop-prometheus into master

We're cleaning up the deprecated Clusters::Applications code related to Remove clusters_applications_* code (#366573 - closed)

Application code that used this table was removed in Clusters::Applications models removal (#388696 - closed)

In !117460 (merged) we dropped the foreign keys. This was in post deploy migration that has been run.

This MR's purpose is to

  • drop the clusters_applications_prometheus table
  • move the dictionary files per these instructions

For transparency, this was originally part of a single MR that drops many clusters_applications* tables, but sensing some concern around this I have split them into individual MRs.

Table usage

Thanos Query showing table usage.

Migration output

main: == [advisory_lock_connection] object_id: 275160, pg_backend_pid: 42029
main: == 20230503173101 DropClustersApplicationsPrometheus: migrating ===============
main: -- drop_table(:clusters_applications_prometheus)
main:    -> 0.0182s
main: == 20230503173101 DropClustersApplicationsPrometheus: migrated (0.0552s) ======

main: == [advisory_lock_connection] object_id: 275160, pg_backend_pid: 42029
ci: == [advisory_lock_connection] object_id: 275380, pg_backend_pid: 42031
ci: == 20230503173101 DropClustersApplicationsPrometheus: migrating ===============
ci: -- drop_table(:clusters_applications_prometheus)
ci:    -> 0.0025s
ci: == 20230503173101 DropClustersApplicationsPrometheus: migrated (0.0261s) ======

ci: == [advisory_lock_connection] object_id: 275380, pg_backend_pid: 42031

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