Generate random passwords and keep them out of the environment/program args

metrics/scripts/enable.sh

@@ -1,6 +1,22 @@
 # |source| this file to enable metrics in the current shell
 
-export SOLANA_METRICS_CONFIG="host=http://localhost:8086,db=testnet,u=write,p=write"
+echoSolanaMetricsConfig() {
+  declare metrics_config_sh
+  metrics_config_sh="$(dirname "${BASH_SOURCE[0]}")"/lib/config.sh
+  if [[ ! -f "$metrics_config_sh" ]]; then
+    echo "Run start.sh first" >&2
+    return 1
+  fi
+  (
+    # shellcheck source=/dev/null
+    source "$metrics_config_sh"
+    echo "host=http://localhost:8086,db=testnet,u=$INFLUXDB_WRITE_USER,p=$INFLUXDB_WRITE_PASSWORD"
+  )
+}
+
+SOLANA_METRICS_CONFIG=$(echoSolanaMetricsConfig)
+export SOLANA_METRICS_CONFIG
+unset -f echoSolanaMetricsConfig
 
 __configure_metrics_sh="$(cd "$(dirname "${BASH_SOURCE[0]}")"/../.. || true; pwd)"/scripts/configure-metrics.sh
 if [[ -f $__configure_metrics_sh ]]; then