[DOC] Add zone-aware ingesters doc (#4486)

* Add zone-aware ingesters doc

* Update docs/sources/tempo/operations/zone-aware-ingesters.md

docs/sources/tempo/operations/zone-aware-ingesters.md

@@ -0,0 +1,26 @@
+---
+title: Zone-aware replication for ingesters
+menuTitle: Zone-aware ingesters
+description: Configure zone-aware ingesters for Tempo
+weight: 900
+---
+
+# Zone-aware replication for ingesters
+
+Zone awareness is a feature that ensures data is replicated across failure domains (which we refer to as “zones”) to provide greater reliability.
+A failure domain is whatever you define it to be, but commonly may be an availability zone, data center, or server rack.
+
+When zone awareness is enabled for ingesters, incoming trace data is guaranteed to be replicated to ingesters in different zones.
+This allows the system to withstand the loss of one or more zones (depending on the replication factor).
+
+Example:
+
+```yaml
+# use the following fields in _config field of JSonnet config, to enable zone-aware ingesters.
+    multi_zone_ingester_enabled: false,
+    multi_zone_ingester_migration_enabled: false,
+    multi_zone_ingester_replicas: 0,
+    multi_zone_ingester_max_unavailable: 25,
+```
+
+For an configuration, refer to the [JSonnet microservices operations example](https://github.com/grafana/tempo/blob/main/operations/jsonnet/microservices/README.md)