fix: make prometheus base url configurable

Catalogger.Backend/Bot/Commands/MetaCommands.cs

@@ -218,7 +218,7 @@ public class MetaCommands(
             await channelApi.EditMessageAsync(msg.ChannelID, msg.ID, content: "", embeds: embeds);
     }
 
-    // TODO: add more checks around response format, configurable prometheus endpoint
+    // TODO: add more checks around response format
     private async Task<double?> MessagesRate()
     {
         if (!config.Logging.EnableMetrics)
@@ -227,7 +227,8 @@ public class MetaCommands(
         try
         {
             var query = HttpUtility.UrlEncode("increase(catalogger_received_messages[5m])");
-            var resp = await _client.GetAsync($"http://localhost:9090/api/v1/query?query={query}");
+            var prometheusUrl = config.Logging.PrometheusUrl ?? "http://localhost:9090";
+            var resp = await _client.GetAsync($"{prometheusUrl}/api/v1/query?query={query}");
             resp.EnsureSuccessStatusCode();
 
             var data = await resp.Content.ReadFromJsonAsync<PrometheusResponse>();

Catalogger.Backend/Config.cs

@@ -33,6 +33,7 @@ public class Config
         public bool EnableMetrics { get; init; } = true;
 
         public string? SeqLogUrl { get; init; }
+        public string? PrometheusUrl { get; init; }
     }
 
     public class DatabaseConfig

Catalogger.Backend/config.example.ini

@@ -7,6 +7,9 @@ LogQueries = false
 SeqLogUrl = http://localhost:5341
 # Whether to enable Prometheus metrics. If disabled, Catalogger will update metrics manually every so often.
 EnableMetrics = false
+# The URL for the Prometheus server. Used for message rate if metrics are enabled.
+# Defaults to http://localhost:9090, should be changed if Prometheus is on another server.
+PrometheusUrl = http://localhost:9090
 
 [Database]
 Url = Host=localhost;Database=postgres;Username=postgres;Password=postgres