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Configure data retention policies in Promscale

You can control how long metric and trace data is retained in Promscale.

A maintenance job periodically removes metric and trace data that is outside the defined retention period. In TimescaleDB 2.0 and above, the maintenance job is automatically scheduled using the job scheduling function. If you are using an earlier version of TimescaleDB, you can use cron or a similar scheduling tool to schedule the maintenance task. See the installation instructions for your platform for more details.

## Configure data retention for metrics You can set a default data retention period for metrics, and override the default on a per-metric basis.

Change the default retention period for metrics by adjusting the retention_period parameter of the function prom_api.set_default_retention_period(retention_period INTERVAL):

SELECT prom_api.set_default_retention_period(30 * INTERVAL '1 day')

If you have specific metrics you need to retain for longer, use the function prom_api.set_metric_retention_period(metric_name TEXT, new_retention_period INTERVAL):

SELECT prom_api.set_metric_retention_period('container_cpu_usage_seconds_total', 180 * INTERVAL '1 day')

Reset an overridden metric retention period to the default by using the function prom_api.reset_metric_retention_period(metric_name TEXT)

SELECT prom_api.reset_metric_retention_period('container_cpu_usage_seconds_total')

Configure data retention for traces

The _ps_trace.span, _ps_trace.event, and _ps_trace.link hypertables have an automated data retention policy which drops chunks beyond a certain age. By default, the retention period is 30 days, or you can use the ps_trace.get_trace_retention_period() function to get the current trace retention period:

SELECT ps_trace.get_trace_retention_period();

You can change the retention period by adjusting the trace_retention_period parameter of the function ps_trace.set_trace_retention_period(trace_retention_period INTERVAL):

SELECT ps_trace.set_trace_retention_period(30 * INTERVAL '1 day');

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