MINOR: contrib/prometheus-exporter: add uweight field

this field was added in commit bd7151002437af1a034a9fdbb582b3cbef5a78d1
("MINOR: stats: report server's user-configured weight next to effective
weight")

Signed-off-by: William Dauchy <wdauchy@gmail.com>
diff --git a/contrib/prometheus-exporter/README b/contrib/prometheus-exporter/README
index f948ac9..4e4bf05 100644
--- a/contrib/prometheus-exporter/README
+++ b/contrib/prometheus-exporter/README
@@ -243,6 +243,7 @@
 | haproxy_backend_client_aborts_total                 | Total number of data transfers aborted by the client.                    |
 | haproxy_backend_server_aborts_total                 | Total number of data transfers aborted by the server.                    |
 | haproxy_backend_weight                              | Service weight.                                                          |
+| haproxy_backend_uweight                             | Sum of active servers'user weights for a backend                         |
 | haproxy_backend_active_servers                      | Current number of active servers.                                        |
 | haproxy_backend_backup_servers                      | Current number of backup servers.                                        |
 | haproxy_backend_check_up_down_total                 | Total number of UP->DOWN transitions.                                    |
@@ -296,6 +297,7 @@
 | haproxy_server_client_aborts_total                 | Total number of data transfers aborted by the client.                     |
 | haproxy_server_server_aborts_total                 | Total number of data transfers aborted by the server.                     |
 | haproxy_server_weight                              | Service weight.                                                           |
+| haproxy_server_uweight                             | Server's user weight                                                      |
 | haproxy_server_check_status                        | Status of last health check, if enabled. (see below for the mapping)      |
 | haproxy_server_check_code                          | layer5-7 code, if available of the last health check.                     |
 | haproxy_server_check_duration_seconds              | Total duration of the latest server health check, in seconds.             |
diff --git a/contrib/prometheus-exporter/service-prometheus.c b/contrib/prometheus-exporter/service-prometheus.c
index ff27df6..debe2f6 100644
--- a/contrib/prometheus-exporter/service-prometheus.c
+++ b/contrib/prometheus-exporter/service-prometheus.c
@@ -280,6 +280,7 @@
 	[ST_F_SAFE_CONN_CUR]=   { .n = IST("safe_idle_connections_current"),    .type = PROMEX_MT_GAUGE,    .flags = (                                                 PROMEX_FL_SRV_METRIC) },
 	[ST_F_USED_CONN_CUR]  = { .n = IST("used_connections_current"),         .type = PROMEX_MT_GAUGE,    .flags = (                                                 PROMEX_FL_SRV_METRIC) },
 	[ST_F_NEED_CONN_EST]  = { .n = IST("need_connections_current"),         .type = PROMEX_MT_GAUGE,    .flags = (                                                 PROMEX_FL_SRV_METRIC) },
+	[ST_F_UWEIGHT]        = { .n = IST("uweight"),                          .type = PROMEX_MT_GAUGE,    .flags = (                         PROMEX_FL_BACK_METRIC | PROMEX_FL_SRV_METRIC) },
 };
 
 /* Description of overriden stats fields */