Update prometheus/promhttp/http.go

Co-authored-by: Bartlomiej Plotka <[email protected]>
Signed-off-by: Manuel Rüger <[email protected]>

Author: mrueg

prometheus/promhttp/http.go

@@ -373,12 +373,17 @@ type HandlerOpts struct {
 	// no effect on the HTTP status code because ErrorHandling is set to
 	// ContinueOnError.
 	Registry prometheus.Registerer
-	// If DisableCompression is true, the handler will never compress the
-	// response, even if requested by the client.
+	// DisableCompression disables the response encoding (compression) and
+	// encoding negotiation. If true, the handler will 
+	// never compress the response, even if requested
+	// by the client and the OfferedCompressions field is ignored.
 	DisableCompression bool
-	// If DisableCompression is false, this option will allow to define the
-	// set of offered encoding algorithms.
-	EncodingOffers []string
+	// OfferedCompressions is a set of encodings (compressions) handler will
+	// try to offer when negotiating with the client. This defaults to zstd, gzip, identity
+	//
+	// NOTE: If handler can't agree on the encodings with the client or caller using unsupported or empty encodings in OfferedCompressions, handler always fallbacks to
+	// no compression (identity), for compatibility reasons. In such cases ErrorLog will be used if set.
+        OfferedCompressions []encoding
 	// The number of concurrent HTTP requests is limited to
 	// MaxRequestsInFlight. Additional requests are responded to with 503
 	// Service Unavailable and a suitable message in the body. If