set as warning log message when the buffer is full (#820)

* set as warning log message when the buffer is full
* Update docs

README.md

@@ -68,7 +68,7 @@
     - [`Scalyr`](docs/loggers/logger_scalyr.md)
     - [`Redis`](docs/loggers/logger_redis.md) publisher
     - [`Kafka`](docs/loggers/logger_kafka.md) producer
-    - [`ClickHouse`](docs/loggers/logger_clickhouse.md) client *(not yet production ready)*
+    - [`ClickHouse`](docs/loggers/logger_clickhouse.md) client
   - *Send to security tools*
     - [`Falco`](docs/loggers/logger_falco.md)
 

docs/configuration.md

@@ -58,7 +58,7 @@ global:
 
 The `interval-monitor` in second(s) is used to count every XX second the number of in/out packets.
 
-The `buffer-size` settings enable to adjust the size of the buffer before discard additional packets. If you encounter the error message buffer is full, xxx packet(s) dropped, consider increasing this parameter to prevent message drops.
+The `buffer-size` settings enable to adjust the size of the buffer before discard additional packets. If you encounter the warning message buffer is full, xxx packet(s) dropped, consider increasing this parameter to prevent message drops.
 
 ```yaml
 global:

docs/performance.md

@@ -1,8 +1,8 @@
 # Performance tuning
 
 All loggers and collectors are based on buffered channels.
-The size of these buffers can be configured with `chan-buffer-size`.
-If you encounter the following error message in your logs, it indicates that you need to increase the chan-buffer-size:
+The size of these buffers can be configured with `buffer-size` in global section.
+If you encounter the following warning message in your logs, it indicates that you need to increase the buffer size:
 
 ```bash
 logger[elastic] buffer is full, 7855 packet(s) dropped

workers/elasticsearch.go

@@ -167,7 +167,7 @@ func (w *ElasticSearchClient) StartLogging() {
 				select {
 				case dataBuffer <- bufCopy:
 				default:
-					w.LogError("Send buffer is full, bulk dropped")
+					w.LogWarning("Send buffer is full, bulk dropped")
 				}
 			}
 
@@ -183,7 +183,7 @@ func (w *ElasticSearchClient) StartLogging() {
 				select {
 				case dataBuffer <- bufCopy:
 				default:
-					w.LogError("automatic flush, send buffer is full, bulk dropped")
+					w.LogWarning("automatic flush, send buffer is full, bulk dropped")
 				}
 			}
 

workers/worker.go

@@ -225,7 +225,7 @@ func (w *GenericWorker) Monitor() {
 		case <-timerMonitor.C:
 			for v, k := range w.droppedWorkerCount {
 				if k > 0 {
-					w.LogError("worker[%s] buffer is full, %d dnsmessage(s) dropped", v, k)
+					w.LogWarning("worker[%s] buffer is full, %d dnsmessage(s) dropped", v, k)
 					w.droppedWorkerCount[v] = 0
 				}
 			}