[OTLP] Decoupling OTEL_EXPORTER_OTLP_CERTIFICATE from mTLS

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/OpenTelemetryProtocolExporterEventSource.cs

@@ -325,5 +325,28 @@ internal void MtlsHttpClientCreationFailed(Exception ex)
         Level = EventLevel.Error)]
     internal void MtlsHttpClientCreationFailed(string exception) =>
         this.WriteEvent(34, exception);
+
+    [Event(
+        35,
+        Message = "CA configured for server validation. Subject: '{0}'.",
+        Level = EventLevel.Informational)]
+    internal void CaCertificateConfigured(string subject) =>
+        this.WriteEvent(35, subject);
+
+    [NonEvent]
+    internal void SecureHttpClientCreationFailed(Exception ex)
+    {
+        if (Log.IsEnabled(EventLevel.Error, EventKeywords.All))
+        {
+            this.SecureHttpClientCreationFailed(ex.ToInvariantString());
+        }
+    }
+
+    [Event(
+        36,
+        Message = "Failed to create secure HttpClient. Exception: {0}",
+        Level = EventLevel.Error)]
+    internal void SecureHttpClientCreationFailed(string exception) =>
+        this.WriteEvent(36, exception);
 #endif
 }

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/OtlpMtlsCertificateManager.cs → src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/OtlpCertificateManager.cs

@@ -10,11 +10,15 @@
 namespace OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation;
 
 /// <summary>
-/// Manages certificate loading, validation, and security checks for mTLS connections.
+/// Manages certificate loading, validation, and security checks for TLS connections.
 /// </summary>
-internal static class OtlpMtlsCertificateManager
+/// <remarks>
+/// This class provides functionality for both simple server certificate trust
+/// (for self-signed certificates) and mTLS client authentication scenarios.
+/// </remarks>
+internal static class OtlpCertificateManager
 {
-    internal const string CaCertificateType = "CA certificate";
+    internal const string CaCertificateType = "CA Certificate";
     internal const string ClientCertificateType = "Client certificate";
     internal const string ClientPrivateKeyType = "Client private key";
 
@@ -218,6 +222,10 @@ public static bool ValidateCertificateChain(
     /// <param name="sslPolicyErrors">The SSL policy errors.</param>
     /// <param name="caCertificate">The CA certificate to validate against.</param>
     /// <returns>True if the certificate is valid; otherwise, false.</returns>
+    /// <remarks>
+    /// This method is used to validate server certificates against a CA.
+    /// Common use case: connecting to a server with a self-signed certificate.
+    /// </remarks>
     internal static bool ValidateServerCertificate(
         X509Certificate2 serverCert,
         X509Chain chain,