Statistics

Currently only the gRPC and file based access logs have statistics.

gRPC access log statistics

The gRPC access log has statistics rooted at access_logs.grpc_access_log. with the following statistics:

Name

Type

Description

logs_written

Counter

Total log entries sent to the logger which were not dropped. This does not imply the logs have been flushed to the gRPC endpoint yet.

logs_dropped

Counter

Total log entries dropped due to network or application level back up.

File access log statistics

The file access log has statistics rooted at the filesystem. namespace.

Name

Type

Description

write_buffered

Counter

Total number of times file data is moved to Envoy’s internal flush buffer

write_completed

Counter

Total number of times a file was successfully written

write_failed

Counter

Total number of times an error occurred during a file write operation

flushed_by_timer

Counter

Total number of times internal flush buffers are written to a file due to flush timeout

reopen_failed

Counter

Total number of times a file was failed to be opened

write_total_buffered

Gauge

Current total size of internal flush buffer in bytes

Fluentd access log statistics

The Fluentd access log has statistics rooted at the access_logs.fluentd.<stat_prefix>. namespace.

Name

Type

Description

entries_lost

Counter

Total number of times an access log entry was discarded due to unavailable connection.

entries_buffered

Counter

Total number of entries (access log record) that was buffered/

events_sent

Counter

Total number of events (Fluentd Forward Mode events) sent to the upstream.

connections_closed

Counter

Total number of times a connection to the upstream cluster was closed.