Add WATCH metrics (#2665)

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Co-authored-by: Oran Agra <[email protected]>

Author: soloestoy

commands/client-list.md

@@ -20,6 +20,7 @@ Here is the meaning of the fields:
 * `psub`: number of pattern matching subscriptions
 * `ssub`: number of shard channel subscriptions. Added in Redis 7.0.3
 * `multi`: number of commands in a MULTI/EXEC context
+* `watch`: number of keys this client is currently watching. Added in Redis 8.0
 * `qbuf`: query buffer length (0 means no query pending)
 * `qbuf-free`: free space of the query buffer (0 means the buffer is full)
 * `argv-mem`: incomplete arguments for the next command (already extracted from query buffer)

commands/info.md

@@ -84,7 +84,9 @@ Here is the meaning of all fields in the **clients** section:
      `BRPOP`, `BRPOPLPUSH`, `BLMOVE`, `BZPOPMIN`, `BZPOPMAX`)
 *   `tracking_clients`: Number of clients being tracked (`CLIENT TRACKING`)
 *   `pubsub_clients`: Number of clients in pubsub mode (`SUBSCRIBE`, `PSUBSCRIBE`, `SSUBSCRIBE`). Added in Redis 8.0
+*   `watching_clients`: Number of clients in watching mode (`WATCH`). Added in Redis 8.0
 *   `clients_in_timeout_table`: Number of clients in the clients timeout table
+*   `total_watched_keys`: Number of watched keys. Added in Redis 8.0.
 *   `total_blocking_keys`: Number of blocking keys. Added in Redis 7.2.
 *   `total_blocking_keys_on_nokey`: Number of blocking keys that one or more clients that would like to be unblocked when the key is deleted. Added in Redis 7.2.