Add Redis section

Signed-off-by: Daniel González Lopes <[email protected]>

docs/tempo/website/configuration/_index.md

@@ -68,10 +68,11 @@ compactor:
 ```
 
 ## [Storage](https:/grafana/tempo/blob/master/tempodb/config.go)
-The storage block is used to configure TempoDB. It supports S3, GCS, local file system, and optionally can use memcached for increased query performance. 
+The storage block is used to configure TempoDB. It supports S3, GCS, local file system, and optionally can use Memcached or Redis for increased query performance. 
 
 The following example shows common options. For platform-specific options refer to the following:
 * [S3](s3/)
+* [Redis](redis/)
 
 ```
 storage:

docs/tempo/website/configuration/redis.md

@@ -0,0 +1,23 @@
+---
+title: Redis
+---
+
+# Redis Configuration
+Redis caching is configured in the storage block.
+
+```
+storage:
+ trace:
+ redis:
+ endpoint: redis # redis endpoint to use when caching.
+ timeout: 500ms # optional. maximum time to wait before giving up on redis requests. (default 100ms)
+ master-name: redis-master # optional. redis Sentinel master name. (default "") 
+ db: 0 # optional. database index. (default 0)
+ expiration: 0s # optional. how long keys stay in the redis. (default 0)
+ tls-enabled: false # optional. enable connecting to redis with TLS. (default false)
+ tls-insecure-skip-verify: false # optional. skip validating server certificate. (default false)
+ pool-size: 0 # optional. maximum number of connections in the pool. (default 0)
+ password: ... # optional. password to use when connecting to redis. (default "")
+ idle-timeout: 0s # optional. close connections after remaining idle for this duration. (default 0s)
+ max-connection-age: 0s # optional. close connections older than this duration. (default 0s)
+```