Code Improvement - Error strings should not be capitalized (#1488)

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

exporters/otlp/otlphttp/driver.go

@@ -193,10 +193,10 @@ func (d *driver) send(ctx context.Context, rawRequest []byte, urlPath string) er
 				return ctx.Err()
 			}
 		default:
-			return fmt.Errorf("Failed with HTTP status %s", response.Status)
+			return fmt.Errorf("failed with HTTP status %s", response.Status)
 		}
 	}
-	return fmt.Errorf("Failed to send data to %s after %d tries", address, d.cfg.maxAttempts)
+	return fmt.Errorf("failed to send data to %s after %d tries", address, d.cfg.maxAttempts)
 }
 
 func (d *driver) getScheme() string {

metric/registry/registry.go

@@ -63,7 +63,7 @@ func (p *MeterProvider) Meter(instrumentationName string, opts ...metric.MeterOp
 // ErrMetricKindMismatch is the standard error for mismatched metric
 // instrument definitions.
 var ErrMetricKindMismatch = fmt.Errorf(
-	"A metric was already registered by this name with another kind or number type")
+	"a metric was already registered by this name with another kind or number type")
 
 // NewUniqueInstrumentMeterImpl returns a wrapped metric.MeterImpl with
 // the addition of uniqueness checking.
@@ -90,7 +90,7 @@ func keyOf(descriptor metric.Descriptor) key {
 // NewMetricKindMismatchError formats an error that describes a
 // mismatched metric instrument definition.
 func NewMetricKindMismatchError(desc metric.Descriptor) error {
-	return fmt.Errorf("Metric was %s (%s %s)registered as a %s %s: %w",
+	return fmt.Errorf("metric was %s (%s %s)registered as a %s %s: %w",
 		desc.Name(),
 		desc.InstrumentationName(),
 		desc.InstrumentationVersion(),