[release-v2.7] Add basic cluster sizing for Tempo doc

docs/sources/tempo/setup/size.md

@@ -0,0 +1,71 @@
+---
+title: Size the cluster
+menuTitle: Size the cluster
+description: Plan the size of your Tempo cluster.
+aliases:
+  - /docs/tempo/deployment
+  - /docs/tempo/deployment/deployment
+  - /docs/tempo/setup/deployment
+weight: 250
+---
+
+# Size the cluster
+
+Resource requirements for your Grafana Tempo cluster depend on the amount and rate of data processed, retained, and queried.
+
+This document provides basic configuration guidelines that you can use as a starting point to help size your own deployment.
+
+{{< admonition type="note" >}}
+Tempo is under continuous development. These requirements can change with each release.
+{{< /admonition >}}
+
+## Factors impacting cluster sizing
+
+The size of the cluster you deploy depends on how many resources it needs for a given ingestion rate and retention: number of spans/time, average byte span size, rate of querying, and retention N days.
+
+Tracing instrumentation also effects your Tempo cluster requirements.
+Refer to [Best practices](https://grafana.com/docs/tempo/<TEMPO_VERSION>/getting-started/best-practices/) for suggestions on determining where to add spans, span length, and attributes.
+
+## Example sample cluster sizing
+
+Distributor:
+
+* 1 replica per every 10MB/s of received traffic
+* CPU: 2 cores
+* Mem: 2 GB
+
+Ingester:
+
+* 1 replica per every 3-5MB/s of received traffic.
+* CPU: 2.5 cores
+* Mem: 4-20GB, determined by trace composition
+
+Querier:
+
+* 1 replica per every 1-2MB/s of received traffic.
+* CPU: dependent on trace size and queries
+* Mem: 4-20GB, determined by trace composition and queries
+* This number of queriers should give good performance for typical search patterns and time ranges. Can scale up or down to fit the specific workload.
+
+Query-Frontend:
+
+* 2 replicas, for high availability
+* CPU: dependent on trace size and queries
+* Mem: 4-20GB, dependent on trace size and queries
+
+Compactor:
+
+* 1 replica per every 3-5 MB/s of received traffic.
+* CPU: 1 core (compactors are primarily I/O bound, therefore do not require much CPU)
+* Mem: 4-20GB, determined by trace composition
+
+## Performance tuning resources
+
+Refer to these documents for additional information on tuning your Tempo cluster:
+
+* [Monitor Tempo](https://grafana.com/docs/tempo/<TEMPO_VERSION>/operations/monitor/)
+* [Tune search performance](https://grafana.com/docs/tempo/<TEMPO_VERSION>/operations/backend_search/)
+* [Improve performance with caching](https://grafana.com/docs/tempo/<TEMPO_VERSION>/operations/caching/)
+* [Dedicated attribute columns](https://grafana.com/docs/tempo/<TEMPO_VERSION>/operations/dedicated_columns/)
+
+For information on more advanced system options, refer to [Manage advanced systems](https://grafana.com/docs/tempo/<TEMPO_VERSION>/operations/manage-advanced-systems/).