diff --git a/contrib/prometheus-exporter/README b/contrib/prometheus-exporter/README
index 84ae8e2..b19acc1 100644
--- a/contrib/prometheus-exporter/README
+++ b/contrib/prometheus-exporter/README
@@ -73,6 +73,14 @@
   /metrics?scope=*&scope=               # ==> no metrics will be exported
   /metrics?scope=&scope=global          # ==> global metrics will be exported
 
+* Filtering on servers state
+
+It is possible to exclude from returned metrics all servers in maintenance mode
+passing the parameter "no-maint" in the query-string. This parameter may help to
+solve performance issues of configuration that use the server templates to
+manage dynamic provisionning. Note there is no consistency check on the servers
+state. So, if the state of a server changes while the exporter is running, only
+a part of the metrics for this server will be dumped.
 
 Exported metrics
 ------------------
diff --git a/contrib/prometheus-exporter/service-prometheus.c b/contrib/prometheus-exporter/service-prometheus.c
index c70daa9..45a4b7a 100644
--- a/contrib/prometheus-exporter/service-prometheus.c
+++ b/contrib/prometheus-exporter/service-prometheus.c
@@ -68,6 +68,7 @@
 #define PROMEX_FL_SCOPE_FRONT   0x00000010
 #define PROMEX_FL_SCOPE_BACK    0x00000020
 #define PROMEX_FL_SCOPE_SERVER  0x00000040
+#define PROMEX_FL_NO_MAINT_SRV  0x00000080
 
 #define PROMEX_FL_SCOPE_ALL (PROMEX_FL_SCOPE_GLOBAL|PROMEX_FL_SCOPE_FRONT|PROMEX_FL_SCOPE_BACK|PROMEX_FL_SCOPE_SERVER)
 
@@ -1905,6 +1906,9 @@
 			while (appctx->ctx.stats.sv) {
 				sv = appctx->ctx.stats.sv;
 
+				if ((appctx->ctx.stats.flags & PROMEX_FL_NO_MAINT_SRV) && (sv->cur_admin & SRV_ADMF_MAINT))
+					goto next_sv;
+
 				switch (appctx->st2) {
 					case ST_F_STATUS:
 						metric = mkf_u32(FO_STATUS, promex_srv_status(sv));
@@ -2075,6 +2079,7 @@
 				if (!promex_dump_metric(appctx, htx, prefix, &metric, &out, max))
 					goto full;
 
+			  next_sv:
 				appctx->ctx.stats.sv = sv->next;
 			}
 
@@ -2271,6 +2276,10 @@
 
 			p += len;
 		}
+		else if (*p == 'n' && (end-p) >= 8 && !memcmp(p, "no-maint", 8)) {
+			appctx->ctx.stats.flags |= PROMEX_FL_NO_MAINT_SRV;
+			p += 8;
+		}
 		else {
 			/* ignore all other params for now */
 			while (p < end && *p != '&')