Valuecounter: Unsupported field type. Must be an int, string or bool. Ignoring. On field HTTP/%{NUMBER:http_version:float}"

[ledzepp4eva]

Relevant telegraf.conf:

[[aggregators.valuecounter]]
  namepass = ["nginx_access_log"]
  fields = ["response","upstream_status","method","ssl_protocol","upstream_response_time","host_header","client_ip","upstream_cache_status","http_version","ssl_cipher"]




[[inputs.logparser]]
  files = ["/var/log/nginx/access.log"]

  [inputs.logparser.grok]
    patterns = ["%{ACCESS_LOG}"]
    custom_patterns = '''
TLSRU [r.-]
NGINX_ERR_DATE %{YEAR}/%{MONTHNUM}/%{MONTHDAY} %{TIME}
NGUSERNAME [a-zA-Z\.\@\-\+_%]+
NGUSER %{NGUSERNAME}
ACCESS_LOG %{IPORHOST:client_ip} - %{NGUSER:remote_user} \[%{HTTPDATE:timestamp}\] "%{WORD:method} %{URIPATHPARAM:request} HTTP/%{NUMBER:http_version:float}" %{NUMBER:response:int} (?:%{NUMBER:bytes:int}|-) (?:"(?:%{URI:referrer}|-)"|%{QS:referrer}) %{QS:user_agent} "(%{DATA:x-forwarded-for}|-)" %{NOTSPACE:upstream_cache_status} %{NUMBER:request_time} %{POSINT:port} %{NOTSPACE:ssl_protocol} %{NOTSPACE:ssl_cipher} %{IP:server_ip} %{GREEDYDATA:host_header} %{GREEDYDATA:hostname} "(%{IP:upstream_address}:%{POSINT:upstream_port:int}\ \:\ %{IP:upstream_address}:%{POSINT:upstream_port:int}|\[%{IP:upstream_address}\]:%{POSINT:upstream_port:int}\ \:\ %{IP:upstream_address}:%{POSINT:upstream_port:int}|%{IP:upstream_address}:%{POSINT:upstream_port:int}|\[%{IP:upstream_address}\]:%{POSINT:upstream_port:int}|-)" "(%{NUMBER:upstream_status:int}\ \:\ %{NUMBER:upstream_status:int}|%{NUMBER:upstream_status:int}|-)" "(%{NUMBER:upstream_response_time:float}\ \:\ %{NUMBER:upstream_response_time:float}|%{NUMBER:upstream_response_time:float}|-)" "(%{NUMBER:upstream_response_length:int}\ \:\ %{NUMBER:upstream_response_length:int}|%{NUMBER:upstream_response_length:int}|-)" %{TLSRU:tls_reuse} %{GREEDYDATA:ssl_server_name} "%{DATA:request_id}"
'''
    measurement = "nginx_access_log"

System info:

Telegraf 1.8.1 (git: HEAD ae9efb2f)
CentOS Linux release 7.5.1804 (Core) 

Steps to reproduce:

1. Implement the above configuration with the following log_format in nginx

log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                  '$status $body_bytes_sent "$http_referer" '
                  '"$http_user_agent" "$http_x_forwarded_for" ' '$upstream_cache_status '
                  '$request_time $server_port $ssl_protocol $ssl_cipher $server_addr $host $hostname '
                  '"$upstream_addr" ' '"$upstream_status" ' '"$upstream_response_time" ' '"$upstream_response_length" '
                  '$ssl_session_reused ' '$ssl_server_name' ' "$request_id"';

2. Try and aggregate the http_version that is marked as a float because of the possible values of 1,1.1 and 2.0

Expected behavior:

I would like to be able to aggregate the http_version field, which is float type.

Actual behavior:

Dec 19 10:20:29 6 telegraf: 2018-12-19T10:20:29Z I! Valuecounter: Unsupported field type. Must be an int, string or bool. Ignoring.

Additional info:

Dec 19 10:20:29 6 telegraf: 2018-12-19T10:20:29Z I! Valuecounter: Unsupported field type. Must be an int, string or bool. Ignoring.