Update README, set timeout as default 10 in configuration sample

README.md

@@ -40,3 +40,9 @@ Sending POST on /reload :
 curl -XPOST http://my-nodegopher-host:8080/reload
 {"message":"configuration successfully reloaded"}
 ```
+
+Reloading a badly formated configuration will produce an error and keep the old configuration running.  
+```
+% curl -XPOST 127.1:8080/reload
+{"error":"Unable to load new configuration, keeping old one. See logs."}
+```

config.sample.yaml

@@ -1,4 +1,4 @@
-# Formatting metrics in main & secondarystat. Supported: "english", "french", "german", "ukrainian", "chinese", "arabic"
+# Formatting metrics in main & secondarystat. Supported: "english", "french", "german", "ukrainian", "chinese", "arabic". Default is english.
 language: 'english'
 
 # datasource describe a way to get prometheus metrics.
@@ -7,51 +7,44 @@ language: 'english'
 # - address: the address of prometheus.
 # - query: prometheus query. Same as typed in prometheus graph page.
 # - type: type of query. "query" will get instant value, "query_range" will get all samples for the grafana period. Result will be averaged.
-# - timeout: query timeout in seconds.
+# - timeout: query timeout in seconds. default is 10.
 datasources:
   - name: prom_samples_per_sec
     type: query
     address: 'http://prometheus.local.lan:9090'
     query: 'rate(prometheus_tsdb_head_samples_appended_total{type="float"}[10m])'
-    timeout: 10
+    timeout: 15
   - name: node_cpu_metric
     # Simple query, return an instant metric
     type: query
     address: 'http://prometheus.local.lan:9090'
     query: 'sum(rate(node_cpu_seconds_total{instance="router01.local.lan:9100",job="node",mode!~"idle"}[30s]))*100'
-    timeout: 10
   - name: node_cpu_metric_over_80
     type: query
     address: 'http://prometheus.local.lan:9090'
     # Return 1 if cpu rate > 80%
     query: '(sum(rate(node_cpu_seconds_total{instance="router01.local.lan:9100",job="node",mode!~"idle"}[30s]))*100) > bool 80'
-    timeout: 10
   - name: router01_net_down_rate
     # Range query. Return all metrics from a time range. Result will be averaged from these metrics. Time range will be provided by Grafana.
     type: query_range
     address: 'http://prometheus.local.lan:9090'
     query: 'rate(node_network_receive_bytes_total{device="igb0", instance="router01.local.lan:9100", job="node"}[30s])'
-    timeout: 10
   - name: router01_net_up_rate
     type: query_range
     address: 'http://prometheus.local.lan:9090'
     query: 'rate(node_network_transmit_bytes_total{device="igb0", instance="router01.local.lan:9100", job="node"}[30s])'
-    timeout: 10
   - name: router01_lan_down_rate
     type: query_range
     address: 'http://prometheus.local.lan:9090'
     query: 'rate(node_network_receive_bytes_total{device="ix3", instance="router01.local.lan:9100", job="node"}[30s])'
-    timeout: 10
   - name: router01_lan_up_rate
     type: query_range
     address: 'http://prometheus.local.lan:9090'
     query: 'rate(node_network_transmit_bytes_total{device="ix3", instance="router01.local.lan:9100", job="node"}[30s])'
-    timeout: 10
   - name: router01_net_down_rate_perten
     type: query
     address: 'http://prometheus.local.lan:9090'
     query: 'rate(node_network_receive_bytes_total{device="igb0", instance="router01.local.lan:9100", job="node"}[30s])/62500000*10'
-    timeout: 10
 
 # graphs identifies context for a nodegraph. You can have many contexts, and your grafana query will mention this context name.
 #  For this example named "internet", grafana URL will be :