Update docs

Signed-off-by: fpetkovski <filip.petkovsky@gmail.com>

docs/components/receive.md

@@ -14,7 +14,7 @@ For more information please check out [initial design proposal](../proposals-don
 
 ## TSDB stats
 
-Thanos Receive supports getting TSDB stats using the `/api/v1/status/tsdb` endpoint. Use the `THANOS-TENANT` HTTP header to get stats for individual Tenants. The output format of the endpoint is compatible with [Prometheus API](https://prometheus.io/docs/prometheus/latest/querying/api/#tsdb-stats).
+Thanos Receive supports getting TSDB stats using the `/api/v1/status/tsdb` endpoint. Use the `THANOS-TENANT` HTTP header to get stats for individual Tenants, or pass a `all_tenants=true` query parameter to get stats for all tenants. The output format of the endpoint is compatible with [Prometheus API](https://prometheus.io/docs/prometheus/latest/querying/api/#tsdb-stats) with the addition of having a `tenant` field indicating the tenant each of the stats belong to.
 
 Note that each Thanos Receive will only expose local stats and replicated series will not be included in the response.