feat: add node_exporter metrics (#1627)

Co-authored-by: Tomás Casagrande <53660242+samoht9277@users.noreply.github.com>
Co-authored-by: JuArce <52429267+JuArce@users.noreply.github.com>

Author: 3 people

Makefile

@@ -1280,3 +1280,8 @@ spamoor_send_transactions: ## Sends normal transactions and also replacement tra
 		-t $(TX_PER_BLOCK) -h http://127.0.0.1:8545/ -h http://127.0.0.1:8550/ -h http://127.0.0.1:8555/ -h http://127.0.0.1:8565/ \
 		--refill-amount 5 --refill-balance 2 --tipfee $(TIP_FEE) --basefee 100  \
 		2>&1 | grep -v 'checked child wallets (no funding needed)'
+
+__NODE_EXPORTER_: ##__
+
+install_node_exporter:
+	@./scripts/install_node_exporter.sh