Memory acquisition error

InfluxDB 2
1

Hello guys！
This is my telegraf configuration

[agent]
  interval = "10s"
  metric_batch_size = 1000
  metric_buffer_limit = 10000
  collection_jitter = "0s"
  flush_interval = "10s"
  flush_jitter = "0s"
  precision = ""
  debug = false
  quiet = false
  logfile = ""
  hostname = "" 
  omit_hostname = false

[[inputs.nginx]]
  urls = ["http://127.0.0.1/nginx_status"]
  response_timeout = "10s"

[[inputs.tail]]
  name_override = "nginx_log"
  files = ["/opt/nginx/logs/access.log"]
  from_beginning = true
  pipe = false
  data_format = "grok"
  grok_patterns = ["%{NGINX_LOG_FORMAT}"]
  grok_custom_pattern_files = []
  grok_custom_patterns = '''
      NGINX_LOG_FORMAT %{IPORHOST:client_ip} (?:%{USERNAME:auth}|-) \[%{HTTPDATE:timestamp}\] "%{WORD:protocol}" "(?:%{DATA:server_name}|-)" "(?:%{WORD:method}|-) (%{URIPATHPARAM:request}?) (HTTP/%{NUMBER:http_version})\" %{NUMBER:response} (?:%{NUMBER:bytes}|-) "%{DATA:referrer}" "%{DATA:user_agent}" "%{DATA:session_id}" (%{DATA:server})? (?:%{NUMBER:request_time:float}|-) (?:%{NUMBER:upstream_response_time:float}|-)
  '''
  grok_timezone = "Local"
  watch_method = "inotify"

[[processors.converter]]
  [processors.converter.fields]
    tag = ["server_name"]

[[processors.override]]
  namepass = ["nginx_log"]
  [processors.override.tags]
    host = "Nginx-PRD"  
#[[processors.converter]]
#  [processors.converter.fields]
#    float = ["request_time", "upstream_response_time"]

#[[outputs.prometheus_client]]
#  listen = ":9125"

WX20240815-092918

My influxdb contains information about the collection of computer resources, where is it collected from, my telegraf is not configured for collection. And the memory information collected is not quite the same as the parameters I’m actually using.

This is my actual memory usage
Mem: 8061404k total, 7551008k used, 510396k free, 161240k buffers
Use about 7 gigabytes.

The query from influxdb looks like this
WX20240815-093406

758751232
That translates to about 700MB.
What’s it about?