MessageTemplate Property

[CraigKennedy]

Is there any way to get the message template sent along (may as a label?)? I would like to filter in loki based on all the entries with a specific Message Template

[m-mccormick]

Dropping two classes in your project should do the trick for the time being:

using System;

namespace MessagTemplateSerilog
{
    using Serilog;
    using Serilog.Configuration;
    using Serilog.Core;
    using Serilog.Events;
    using Serilog.Sinks.Loki;

    class Program
    {
        static void Main(string[] args)
        {
            var log = new LoggerConfiguration().
                      Enrich.WithMessageTemplate().
                      WriteTo.LokiHttp(new NoAuthCredentials("http://localhost:3100")).CreateLogger();
            
            log.Information("An int {name} with a value {value}", "myIntName", 8);
            log.Dispose();
        }
    }

    public class MessageTemplateEnricher : ILogEventEnricher
    {
        public void Enrich(LogEvent logEvent, ILogEventPropertyFactory propertyFactory)
        {
            LogEventProperty property = propertyFactory.CreateProperty("Message_Template", logEvent.MessageTemplate.Text);
            logEvent.AddPropertyIfAbsent(property);
        }
    }

    public static class MessageTemplateEnricherExtensions
    {
        public static LoggerConfiguration WithMessageTemplate(
            this LoggerEnrichmentConfiguration enrichmentConfiguration)
        {
            if (enrichmentConfiguration == null)
                throw new ArgumentNullException(nameof(enrichmentConfiguration));

            return enrichmentConfiguration.With<MessageTemplateEnricher>();
        }
    }
}

Keep in mind that you'll have to use a regex search (using .) since loki doesn't like the { and } characters in queries, so you won't be able to search for an exact match but it should be close enough.

{Message_Template=~"An int .name. with a value .value."}

[qiqistart]

I’d like to know that how to use serilog.loki to establish a customizing client to make an index for writing logs as Elasticsearch.?