TTL

In SkyWalking, there are two types of observability data:

1. Records include traces, logs, topN sampled statements and alarm. recordDataTTL applies to record data.
2. Metrics include all metrics for service, instance, endpoint, and topology map. Metadata(lists of services, instances, or endpoints) also belongs to metrics. metricsDataTTL applies to Metrics data.

These are the settings for the different types:

    # Set a timeout on metrics data. After the timeout has expired, the metrics data will automatically be deleted.
    recordDataTTL: ${SW_CORE_RECORD_DATA_TTL:3} # Unit is day
    metricsDataTTL: ${SW_CORE_METRICS_DATA_TTL:7} # Unit is day