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Update ttl.md to add another 2 types of model relating to recordTTL (#7760)

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吴晟 Wu Sheng 2021-09-22 09:13:10 +08:00 committed by GitHub
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docs/en/setup/backend/ttl.md
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@ -1,7 +1,7 @@
# TTL
In SkyWalking, besides metadata, there are two types of observability data:
1. Record: Includes trace and alarm. Log may also be included in the future.
1. Metric: Includes percentile, heat map, success rate, cpm (rpm), etc.
In SkyWalking, there are two types of observability data:
1. Records include traces, logs, topN sampled statements and alarm. `recordDataTTL` applies to **record** data.
1. 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:
```yaml
@ -10,5 +10,3 @@ These are the settings for the different types:
metricsDataTTL: ${SW_CORE_METRICS_DATA_TTL:7} # Unit is day
```
- `recordDataTTL` applies to **record** data, including tracing and alarm.
- `metricsDataTTL` applies to all metrics, including the metrics for service, instance, endpoint, and topology map.