[7.x][ML] More advanced model snapshot retention options #56194
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This PR implements the following changes to make ML model snapshot retention more flexible in advance of adding a UI for the feature in an upcoming release. - The default for `model_snapshot_retention_days` for new jobs is now 10 instead of 1 - There is a new job setting, `daily_model_snapshot_retention_after_days`, that defaults to 1 for new jobs and `model_snapshot_retention_days` for pre-7.8 jobs - For days that are older than `model_snapshot_retention_days`, all model snapshots are deleted as before - For days that are in between `daily_model_snapshot_retention_after_days` and `model_snapshot_retention_days` all but the first model snapshot for that day are deleted - The `retain` setting of model snapshots is still respected to allow selected model snapshots to be retained indefinitely Backport of elastic#56125
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This PR implements the following changes to make ML model snapshot
retention more flexible in advance of adding a UI for the feature in
an upcoming release.
model_snapshot_retention_daysfor new jobs is now10 instead of 1
daily_model_snapshot_retention_after_days,that defaults to 1 for new jobs and
model_snapshot_retention_daysfor pre-7.8 jobs
model_snapshot_retention_days, allmodel snapshots are deleted as before
daily_model_snapshot_retention_after_daysand
model_snapshot_retention_daysall but the first model snapshotfor that day are deleted
retainsetting of model snapshots is still respected to allowselected model snapshots to be retained indefinitely
Backport of #56125