PMM-14594 Backup compatibility fix.

[JiriCtvrtka]

https://jira.percona.com/browse/PMM-14594

PMM PR: percona/pmm#5395

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4368-377dfd9
Client docker: perconalab/pmm-client-fb:PR-4368-377dfd9
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4368-377dfd9
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4368-377dfd9.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4368-377dfd9&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4368-377dfd9.tar.gz

[JNKPercona]

API tests have failed: https://pmm.cd.percona.com/job/pmm3-api-tests/6201/

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4368-9e7fadb
Client docker: perconalab/pmm-client-fb:PR-4368-9e7fadb
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4368-9e7fadb
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4368-9e7fadb.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4368-9e7fadb&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4368-9e7fadb.tar.gz

[JNKPercona]

API tests have failed: https://pmm.cd.percona.com/job/pmm3-api-tests/6219/

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4368-0ccd961
Client docker: perconalab/pmm-client-fb:PR-4368-0ccd961
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4368-0ccd961
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4368-0ccd961.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4368-0ccd961&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4368-0ccd961.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/6435/

[JNKPercona]

Server docker: perconalab/pmm-server-fb:PR-4368-d9735a4
Client docker: perconalab/pmm-client-fb:PR-4368-d9735a4
Watchtower docker: perconalab/pmm-watchtower-fb:PR-4368-d9735a4
Client tarball: https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4368-d9735a4.tar.gz
Staging instance: https://pmm.cd.percona.com/job/pmm3-aws-staging-start/parambuild/?DOCKER_VERSION=perconalab/pmm-server-fb:PR-4368-d9735a4&CLIENT_VERSION=https://s3.us-east-2.amazonaws.com/pmm-build-cache/PR-BUILDS/pmm-client/pmm-client-PR-4368-d9735a4.tar.gz

[JNKPercona]

API tests have succeded: https://pmm.cd.percona.com/job/pmm3-api-tests/6442/