Remove deprecated mqtrigger with kind fission (#2875)

* Remove deprecated mqtrigger with kind fission
* Remove unused deps

---------

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/mqtrigger/metrics.go

@@ -1,71 +0,0 @@
-/*
-Copyright 2022 The Fission Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package mqtrigger
-
-import (
-	"github.com/prometheus/client_golang/prometheus"
-
-	"github.com/fission/fission/pkg/utils/metrics"
-)
-
-var (
-	labels            = []string{"trigger_name", "trigger_namespace"}
-	subscriptionCount = prometheus.NewGaugeVec(
-		prometheus.GaugeOpts{
-			Name: "fission_mqt_subscriptions",
-			Help: "Total number of subscriptions to mq currently",
-		},
-		[]string{},
-	)
-	messageCount = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Name: "fission_mqt_messages_processed_total",
-			Help: "Total number of messages processed",
-		},
-		labels,
-	)
-	messageLagCount = prometheus.NewGaugeVec(
-		prometheus.GaugeOpts{
-			Name: "fission_mqt_message_lag",
-			Help: "Total number of messages lag per topic and partition",
-		},
-		[]string{"trigger_name", "trigger_namespace", "topic", "partition"},
-	)
-)
-
-func IncreaseSubscriptionCount() {
-	subscriptionCount.WithLabelValues().Inc()
-}
-
-func DecreaseSubscriptionCount() {
-	subscriptionCount.WithLabelValues().Dec()
-}
-
-func IncreaseMessageCount(trigname, trignamespace string) {
-	messageCount.WithLabelValues(trigname, trignamespace).Inc()
-}
-
-func SetMessageLagCount(trigname, trignamespace, topic, partition string, lag int64) {
-	messageLagCount.WithLabelValues(trigname, trignamespace, topic, partition).Set(float64(lag))
-}
-
-func init() {
-	registry := metrics.Registry
-	registry.MustRegister(subscriptionCount)
-	registry.MustRegister(messageCount)
-	registry.MustRegister(messageLagCount)
-}