exporters/otlp: default max request size to 64 MiB (#8365)

Per https://github.com/open-telemetry/opentelemetry-proto/pull/782 where
we agreed to have 64 MiB as the default limit.

internal/shared/otlp/otlpmetric/oconf/options.go.tmpl

@@ -37,7 +37,7 @@ const (
 	DefaultMetricsPath string = "/v1/metrics"
 	// DefaultMaxRequestSize is the default maximum size of a serialized export
 	// request, before compression.
-	DefaultMaxRequestSize int = 32 * 1024 * 1024
+	DefaultMaxRequestSize int = 64 * 1024 * 1024
 	// DefaultBackoff is a default base backoff time used in the
 	// exponential backoff strategy.
 	DefaultBackoff time.Duration = 300 * time.Millisecond

internal/shared/otlp/otlpmetric/oconf/options_test.go.tmpl

@@ -79,7 +79,7 @@ func TestConfigs(t *testing.T) {
 				}
 				assert.Equal(t, NoCompression, c.Metrics.Compression)
 				assert.Equal(t, map[string]string(nil), c.Metrics.Headers)
-				assert.Equal(t, DefaultMaxRequestSize, c.Metrics.MaxRequestSize)
+				assert.Equal(t, 64*1024*1024, c.Metrics.MaxRequestSize)
 				assert.Equal(t, 10*time.Second, c.Metrics.Timeout)
 			},
 		},

internal/shared/otlp/otlptrace/otlpconfig/options.go.tmpl

@@ -33,7 +33,7 @@ const (
 	DefaultTracesPath string = "/v1/traces"
 	// DefaultMaxRequestSize is the default maximum size of a serialized export
 	// request, before compression.
-	DefaultMaxRequestSize int = 32 * 1024 * 1024
+	DefaultMaxRequestSize int = 64 * 1024 * 1024
 	// DefaultTimeout is a default max waiting time for the backend to process
 	// each span batch.
 	DefaultTimeout time.Duration = 10 * time.Second

internal/shared/otlp/otlptrace/otlpconfig/options_test.go.tmpl

@@ -77,7 +77,7 @@ func TestConfigs(t *testing.T) {
 				}
 				assert.Equal(t, NoCompression, c.Traces.Compression)
 				assert.Equal(t, map[string]string(nil), c.Traces.Headers)
-				assert.Equal(t, DefaultMaxRequestSize, c.Traces.MaxRequestSize)
+				assert.Equal(t, 64*1024*1024, c.Traces.MaxRequestSize)
 				assert.Equal(t, 10*time.Second, c.Traces.Timeout)
 			},
 		},