LOKI Promtail configuration for .NET core with serilog compact format

config.yaml

server:
    http_listen_port: 9080
    grpc_listen_port: 0

positions:
    filename: /tmp/positions.yaml

clients:
    - url: http://loki:3100/api/prom/push

scrape_configs:
- job_name: system
  static_configs:
  - targets:
      - localhost
    labels:
      __path__: /var/logs/*.log
  pipeline_stages: 
  - json: 
      timestamp:
        source: '"@t"'
        format: RFC3339
      labels:
        level:
          source: '"@l"'
        venue:
          source: "venueId"
        application:
          source: "Application"
      output:
        source: '{message: "@m", stack: "@x"}'

Hello! I have a .net web application and I want to monitorize with grafana. Im using windows, I have the grafana service running and also Loki and Promtail running on terminal. Seems all is running, but I cant send logs with promtail to Loki. I created a logs file where my .net app is writing, I changed the promtail config to read from that log file, but promtail cant communicate to loki through the endpoint http://localhost:3100/loki/api/v1/push. I dont know what is the problem, but I think I'll change the grafana, loki and promtail to be running with docker. Another observation is that I can send a log to loki via curl command, this one:

"curl -v -H "Content-Type: application/json" -XPOST -s "http://localhost:3100/loki/api/v1/push" --data-raw
'{"streams": [{ "stream": { "foo": "bar2" }, "values": [ [ "1570818238000000000", "fizzbuzz" ] ] }]}'".

If I send manually the log I can add a new DataSource in grafana, but with promtail I'm unable. On promtail terminal I got this error: "level=warn ts=2023-07-25T10:00:48.3616291Z caller=client.go:379 component=client host=localhost:3100 msg="error sending batch, will retry" status=-1 error="Post "http://localhost:3100/loki/api/v1/push\": context deadline exceeded"" while he's running.

Do you have any recomendation for me to test?

Best Regards,
Helder