[prometheus] Update links to openmetrics to reference the v1.0.0 release (#6029)

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/CHANGELOG.md

@@ -150,7 +150,7 @@ Released 2022-Sep-29
   ([#3651](https://github.com/open-telemetry/opentelemetry-dotnet/pull/3651))
 
 * Added `"# EOF\n"` ending following the [OpenMetrics
-  specification](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md)
+  specification](https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md)
   ([#3654](https://github.com/open-telemetry/opentelemetry-dotnet/pull/3654))
 
 ## 1.4.0-alpha.2

src/OpenTelemetry.Exporter.Prometheus.HttpListener/CHANGELOG.md

@@ -147,7 +147,7 @@ Released 2022-Sep-29
   ([#3651](https://github.com/open-telemetry/opentelemetry-dotnet/pull/3651))
 
 * Added `"# EOF\n"` ending following the [OpenMetrics
-  specification](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md)
+  specification](https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md)
   ([#3654](https://github.com/open-telemetry/opentelemetry-dotnet/pull/3654))
 
 ## 1.4.0-alpha.2

src/OpenTelemetry.Exporter.Prometheus.HttpListener/Internal/PrometheusMetric.cs

@@ -37,7 +37,7 @@ internal sealed class PrometheusMetric
             sanitizedUnit = GetUnit(unit);
 
             // The resulting unit SHOULD be added to the metric as
-            // [OpenMetrics UNIT metadata](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#metricfamily)
+            // [OpenMetrics UNIT metadata](https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#metricfamily)
             // and as a suffix to the metric name. The unit suffix comes before any type-specific suffixes.
             // https://github.com/open-telemetry/opentelemetry-specification/blob/3dfb383fe583e3b74a2365c5a1d90256b273ee76/specification/compatibility/prometheus_and_openmetrics.md#metric-metadata-1
             if (!sanitizedName.EndsWith(sanitizedUnit))
@@ -57,14 +57,14 @@ internal sealed class PrometheusMetric
         }
 
         // For counters requested using OpenMetrics format, the MetricFamily name MUST be suffixed with '_total', regardless of the setting to disable the 'total' suffix.
-        // https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#counter-1
+        // https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#counter-1
         if (type == PrometheusType.Counter && !openMetricsName.EndsWith("_total"))
         {
             openMetricsName += "_total";
         }
 
         // In OpenMetrics format, the UNIT, TYPE and HELP metadata must be suffixed with the unit (handled above), and not the '_total' suffix, as in the case for counters.
-        // https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#unit
+        // https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#unit
         var openMetricsMetadataName = type == PrometheusType.Counter
             ? SanitizeOpenMetricsName(openMetricsName)
             : sanitizedName;
@@ -241,7 +241,7 @@ internal sealed class PrometheusMetric
     // OTLP metrics use the c/s notation as specified at https://ucum.org/ucum.html
     // (See also https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/metrics.md#instrument-units)
     // Prometheus best practices for units: https://prometheus.io/docs/practices/naming/#base-units
-    // OpenMetrics specification for units: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#units-and-base-units
+    // OpenMetrics specification for units: https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#units-and-base-units
     private static string MapUnit(ReadOnlySpan<char> unit)
     {
         return unit switch

src/Shared/Proto/opentelemetry/proto/metrics/v1/metrics.proto

@@ -430,7 +430,7 @@ message HistogramDataPoint {
   // events, and is assumed to be monotonic over the values of these events.
   // Negative events *can* be recorded, but sum should not be filled out when
   // doing so.  This is specifically to enforce compatibility w/ OpenMetrics,
-  // see: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#histogram
+  // see: https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#histogram
   optional double sum = 5;
 
   // bucket_counts is an optional field contains the count values of histogram
@@ -509,7 +509,7 @@ message ExponentialHistogramDataPoint {
   // events, and is assumed to be monotonic over the values of these events.
   // Negative events *can* be recorded, but sum should not be filled out when
   // doing so.  This is specifically to enforce compatibility w/ OpenMetrics,
-  // see: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#histogram
+  // see: https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#histogram
   optional double sum = 5;
   
   // scale describes the resolution of the histogram.  Boundaries are
@@ -622,7 +622,7 @@ message SummaryDataPoint {
   // events, and is assumed to be monotonic over the values of these events.
   // Negative events *can* be recorded, but sum should not be filled out when
   // doing so.  This is specifically to enforce compatibility w/ OpenMetrics,
-  // see: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#summary
+  // see: https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#summary
   double sum = 5;
 
   // Represents the value at a given quantile of a distribution.