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Comment: Add KIP-386 to adopted

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Use this number as the identifier for your KIP and increment this value.

Adopted KIPs


KIP

Release

1KIP-386: Standardize on Min/Avg/Max metrics' default value2.2.0 (WIP)
2KIP-380: Detect outdated control requests and bounced brokers using broker generation2.2.0 (WIP)
23KIP-377: TopicCommand to use AdminClient2.2.0 (WIP)
34KIP-331 Add default implementation to close() and configure() for Serializer, Deserializer and Serde2.2.0 (WIP)
45KIP-372: Naming Repartition Topics for Joins and Grouping2.1.0
56KIP-371: Add a configuration to build custom SSL principal name2.2.0 (WIP)
67KIP 368: Allow SASL Connections to Periodically Re-Authenticate2.2.0 (WIP)
78KIP-367 Introduce close(Duration) to Producer and AdminClient instead of close(long, TimeUnit)2.2.0 (WIP)
89KIP-366: Make FunctionConversions deprecated2.1.0
910KIP-365: Materialized, Serialized, Joined, Consumed and Produced with implicit Serde2.1.0
1011KIP-361: Add Consumer Configuration to Disable Auto Topic Creation2.2.0 (WIP)
1112KIP-359: Verify leader epoch in produce requests2.2.0 (WIP)
1213KIP-358: Migrate Streams API to Duration instead of long ms times2.2.0 (WIP)
1314KIP-357: Add support to list ACLs per principal2.1.0
1415KIP-356: Add withCachingDisabled() to StoreBuilder2.1.0
1516KIP-353: Improve Kafka Streams Timestamp Synchronization2.1.0
1617KIP-342 Add support for custom SASL extensions in OAuthBearer authentication2.1.0
1718KIP-341: Update Sticky Assignor's User Data Protocol2.2.0 (WIP)
1819KIP-339: Create a new IncrementalAlterConfigs API2.2.0 (WIP)
1920KIP-338 Support to exclude the internal topics in kafka-topics.sh command2.1.0
2021KIP-340: Allow kafka-reassign-partitions.sh and kafka-log-dirs.sh to take admin client property file2.1.0
2122KIP-336: Consolidate ExtendedSerializer/Serializer and ExtendedDeserializer/Deserializer2.1.0
2223KIP-332: Update AclCommand to use AdminClient API2.1.0
2324KIP-330: Add retentionPeriod in SessionBytesStoreSupplier2.1.0
2425KIP-328: Ability to suppress updates for KTables2.2.0 (WIP)
2526KIP-324: Add method to get metrics() in AdminClient2.1.0
2627KIP-322: Return new error code for DeleteTopics API when topic deletion disabled.2.1.0
2728KIP-321: Update TopologyDescription to better represent Source and Sink Nodes2.1.0
2829KIP-320: Allow fetchers to detect and handle log truncation2.1.0
2930KIP-319: Replace segments with segmentInterval in WindowBytesStoreSupplier2.1.0
3031KIP-313: Add KStream.flatTransform and KStream.flatTransformValues 2.2.0 (WIP)
3132KIP-312 Add Overloaded StreamsBuilder Build Method to Accept java.util.Properties2.1.0
3233KIP-308: Support dynamic update of max.connections.per.ip/max.connections.per.ip.overrides2.1.0
3334KIP-306: Configuration for Delaying Response to Failed Authentication2.1.0
3435KIP-305: Add Connect primitive number converters2.0.0
3536KIP-303: Add Dynamic Routing in Streams Sink2.0.0
3637KIP-302 - Enable Kafka clients to use all DNS resolved IP addresses2.1.0
3738KIP-298: Error Handling in Connect2.0.0
3839KIP-297: Externalizing Secrets for Connect Configurations2.0.0
3940KIP-295 Add Streams Configuration Allowing for Optional Topology Optimization2.0.0
4041KIP-294 - Enable TLS hostname verification by default2.0.0
4142KIP-292: Add transformValues() method to KTable2.0.0
4243KIP-290: Support for Prefixed ACLs2.0.0
4344KIP-289: Improve the default group id behavior in KafkaConsumer2.2.0 (WIP)
4445KIP-285: Connect Rest Extension Plugin2.0.0
4546KIP-284: Set default retention ms for Streams repartition topics to Long.MAX_VALUE2.0.0
4647KIP-283: Efficient Memory Usage for Down-Conversion2.0.0
4748KIP-282: Add the listener name to the authentication context2.0.0
4849KIP-281: ConsumerPerformance: Increase Polling Loop Timeout and Make It Reachable by the End User2.0.0
4950KIP-279: Fix log divergence between leader and follower after fast leader fail over2.0.0
5051KIP-278 - Add version option to Kafka's commands2.0.0
5152KIP-277 - Fine Grained ACL for CreateTopics API2.0.0
5253KIP-276 - Add StreamsConfig prefix for different consumers2.0.0
5354KIP-274: Kafka Streams Skipped Records Metrics2.0.0
5455KIP-272: Add API version tag to broker's RequestsPerSec metric2.0.0
5556KIP-270 - A Scala Wrapper Library for Kafka Streams2.0.0
5657KIP-268: Simplify Kafka Streams Rebalance Metadata Upgrade2.0.0
5758KIP-267: Add Processor Unit Test Support to Kafka Streams Test Utils2.0.0
5859KIP-266: Fix consumer indefinite blocking behavior2.0.0
5960KIP-265: Make Windowed Serde to public APIs2.0.0
6061KIP-261: Add Single Value Fetch in Window Stores2.0.0
6162KIP-257 - Configurable Quota Management2.0.0
6263KIP-255: OAuth Authentication via SASL/OAUTHBEARER2.0.0
6364KIP-251: Allow timestamp manipulation in Processor API2.0.0
6465KIP-249: Add Delegation Token Operations to KafkaAdminClient2.0.0
6566KIP-247: Add public test utils for Kafka Streams1.1.0
6667KIP-245: Use Properties instead of StreamsConfig in KafkaStreams constructor2.0.0
6768KIP-244: Add Record Header support to Kafka Streams Processor API2.0.0
6869KIP-243: Make ProducerConfig and ConsumerConfig constructors public1.1.0
6970KIP-239 Add queryableStoreName() to GlobalKTable1.1.0
7071KIP-238: Expose Kafka cluster ID in Connect REST API1.1.0
7172KIP-237: More Controller Health Metrics2.0.0
7273KIP-235: Add DNS alias support for secured connection2.1.0
7374KIP-233: Simplify StreamsBuilder#addGlobalStore1.1.0
7475KIP-231: Improve the Required ACL of ListGroups API2.1.0
7576KIP-229: DeleteGroups API1.1.0
7677KIP-227 - Introduce Incremental FetchRequests to Increase Partition Scalability1.1.0
7778KIP-226 - Dynamic Broker Configuration1.1.0
7879KIP-225 - Use tags for consumer “records.lag” metrics1.1.0
7980KIP-224: Add configuration parameter `retries` to Streams API1.1.0
8081KIP-223 - Add per-topic min lead and per-partition lead metrics to KafkaConsumer2.0.0
8182KIP-222 - Add Consumer Group operations to Admin API2.0.0
8283KIP-220: Add AdminClient into Kafka Streams' ClientSupplier1.1.0
8384KIP-219 - Improve quota communication2.0.0
8485KIP-218: Make KafkaFuture.Function java 8 lambda compatible1.1.0
8586KIP-215: Add topic regex support for Connect sinks1.1.0
8687KIP-214: Add zookeeper.max.in.flight.requests config to the broker1.1.0
8788KIP-212: Enforce set of legal characters for connector names1.1.0
8889KIP-211: Revise Expiration Semantics of Consumer Group Offsets2.1.0
8990KIP-210 - Provide for custom error handling when Kafka Streams fails to produce1.1.0
9091KIP-208: Add SSL support to Kafka Connect REST interface1.1.0
9192KIP-207: Offsets returned by ListOffsetsResponse should be monotonically increasing even during a partition leader change2.2.0 (WIP)
9293KIP-206: Add support for UUID serialization and deserialization2.1.0
9394KIP-205: Add all() and range() API to ReadOnlyWindowStore1.1.0
9495KIP-204 : Adding records deletion operation to the new Admin Client API1.1.0
9596KIP-203: Add toLowerCase support to sasl.kerberos.principal.to.local rule 1.1.0
9697KIP-202: Move merge() from StreamsBuilder to KStream1.0.0
9798KIP-198: Remove ZK dependency from Streams Reset Tool1.0.0
9899KIP-197 Connect REST API should include the connector type when describing a connector1.0.0
99100KIP-196: Add metrics to Kafka Connect framework1.0.0
100101KIP-195: AdminClient.createPartitions1.0.0
101102KIP-192 : Provide cleaner semantics when idempotence is enabled1.0.0
102103KIP-191: KafkaConsumer.subscribe() overload that takes just Pattern1.0.0
103104KIP-190: Handle client-ids consistently between clients and brokers1.0.0
104105KIP-189: Improve principal builder interface and add support for SASL1.0.0
105106KIP-188 - Add new metrics to support health checks1.0.0
106107KIP-187 - Add cumulative count metric for all Kafka rate metrics1.0.0
107108KIP-186: Increase offsets retention default to 7 days2.0.0
108109KIP-183 - Change PreferredReplicaLeaderElectionCommand to use AdminClient2.0.0
109110KIP-182: Reduce Streams DSL overloads and allow easier use of custom storage engines1.0.0
110111KIP-180: Add a broker metric specifying the number of consumer group rebalances in progress1.1.0
111112KIP-177: Consumer perf tool should count rebalance time1.0.0
112113KIP-176: Remove deprecated new-consumer option for tools2.0.0
113114KIP-175: Additional '--describe' views for ConsumerGroupCommand1.1.0
114115KIP-174 - Deprecate and remove internal converter configs in WorkerConfig2.0.0
115116KIP-173: Add prefix to StreamsConfig to enable setting default internal topic configs1.0.0
116117KIP-171 - Extend Consumer Group Reset Offset for Stream Application1.1.0
117118KIP-168: Add GlobalTopicCount and GlobalPartitionCount metric per cluster1.0.0
118119KIP-167: Add interface for the state store restoration process1.0.0
119120

KIP-164 - Add UnderMinIsrPartitionCount and per-partition UnderMinIsr metrics

1.0.0
120121

KIP-163: Lower the Minimum Required ACL Permission of OffsetFetch

1.0.0
121122KIP-162: Enable topic deletion by default1.0.0
122123KIP-161: streams deserialization exception handlers1.0.0
123124KIP-160: Augment KStream.print(), KStream.writeAsText() to allow users pass in extra parameters in the printed string1.0.0
124125KIP-157 - Add consumer config options to streams reset tool1.0.0
125126KIP-156 Add option "dry run" to Streams application reset tool0.11.0.0
126127KIP-155 - Add range scan for windowed state stores0.11.0.0
127128KIP-154 Add Kafka Connect configuration properties for creating internal topics0.11.0.0
128129KIP-153: Include only client traffic in BytesOutPerSec metric0.11.0.0
129130KIP-152 - Improve diagnostics for SASL authentication failures1.0.0
130131KIP-151 Expose Connector type in REST API0.11.0.0
131132KIP-150 - Kafka-Streams Cogroup2.2.0 (WIP)
132133KIP-149: Enabling key access in ValueTransformer, ValueMapper, and ValueJoiner1.1.0 (partially implemented)
(WIP for 2.2.0)
133134KIP-146 - Classloading Isolation in Connect

0.11.0.0

134135KIP-145 - Expose Record Headers in Kafka Connect1.1.0
135136KIP-144: Exponential backoff for broker reconnect attempts0.11.0.0
136137KIP-143: Controller Health Metrics0.11.0.0
137138KIP-140: Add administrative RPCs for adding, deleting, and listing ACLs0.11.0.0
138139KIP-138: Change punctuate semantics1.0.0
139140KIP-137: Enhance TopicCommand --describe to show topics marked for deletion0.11.0.0
140141KIP-136: Add Listener name to SelectorMetrics tags0.11.0.0
141142KIP-134: Delay initial consumer group rebalance0.11.0.0
142143KIP-133: Describe and Alter Configs Admin APIs0.11.0.0
143144KIP-130: Expose states of active tasks to KafkaStreams public API1.0.0
144145KIP-129: Streams Exactly-Once Semantics0.11.0.0
145146KIP-128: Add ByteArrayConverter for Kafka Connect0.11.0.0
146147KIP-126 - Allow KafkaProducer to split and resend oversized batches.0.11.0.0
147148KIP-124 - Request rate quotas0.11.0.0
148149KIP-123: Allow per stream/table timestamp extractor0.11.0.0
149150KIP-122: Add Reset Consumer Group Offsets tooling0.11.0.0
150151KIP-121: Add KStream peek method

0.11.0.0

151152KIP-120: Cleanup Kafka Streams builder API1.0.0
152153KIP-119: Drop Support for Scala 2.10 in Kafka 0.110.11.0.0
153154KIP-118: Drop Support for Java 72.0.0
154155KIP-117: Add a public AdminClient API for Kafka admin operations0.11.0.0
155156KIP-115: Enforce offsets.topic.replication.factor upon __consumer_offsets auto topic creation0.11.0.0
156157KIP-114: KTable state stores and improved semantics0.11.0.0
157158KIP-113: Support replicas movement between log directories1.1.0
158159KIP-112: Handle disk failure for JBOD1.0.0
159160KIP-110: Add Codec for ZStandard Compression2.1.0
160161KIP-109: Old Consumer Deprecation0.11.0.0
161162KIP-108: Create Topic Policy0.10.2.0
162163KIP-107: Add deleteRecordsBefore() API in AdminClient0.11.0.0
163164

KIP-106 - Change Default unclean.leader.election.enabled from True to False

0.11.0.0
164165KIP-105: Addition of Record Level for Sensors0.10.2.0
165166KIP-104: Granular Sensors for Streams 0.10.2.0
166167KIP-103: Separation of Internal and External traffic0.10.2.0
167168KIP-102 - Add close with timeout for consumers0.10.2.0
168169KIP-101 - Alter Replication Protocol to use Leader Epoch rather than High Watermark for Truncation0.11.0.0
169170KIP-100 - Relax Type constraints in Kafka Streams API0.10.2.0
170171KIP-99: Add Global Tables to Kafka Streams0.10.2.0
171172KIP-98 - Exactly Once Delivery and Transactional Messaging0.11.0.0
172173KIP-97: Improved Kafka Client RPC Compatibility Policy0.10.2.0
173174KIP-96 - Add per partition metrics for in-sync and assigned replica count0.10.2.0
174175KIP-94 Session Windows0.10.2.0
175176KIP-93: Improve invalid timestamp handling in Kafka Streams0.10.2.0
176177KIP-92 - Add per partition lag metrics to KafkaConsumer0.10.2.0
177178KIP-91 Provide Intuitive User Timeouts in The Producer2.1.0
178179KIP-90 - Remove zkClient dependency from Streams0.10.2.0
179180KIP-89: Allow sink connectors to decouple flush and offset commit0.10.2.0
180181KIP-88: OffsetFetch Protocol Update0.10.2.0
181182KIP-86: Configurable SASL callback handlers2.0.0
182183KIP-85: Dynamic JAAS configuration for Kafka clients0.10.2.0
183184KIP-84: Support SASL SCRAM mechanisms0.10.2.0
184185KIP-82 - Add Record Headers0.11.0.0
185186KIP-81: Bound Fetch memory usage in the consumer2.2.0 (WIP)
186187KIP-79 - ListOffsetRequest/ListOffsetResponse v1 and add timestamp search methods to the new consumer0.10.1.0
187188KIP-78: Cluster Id0.10.1.0
188189KIP-77: Improve Kafka Streams Join Semantics0.10.2.0
189190KIP-75 - Add per-connector Converters0.10.1.0
190191KIP-74: Add Fetch Response Size Limit in Bytes0.10.1.0
191192KIP-73: Replication Quotas0.10.1.0
192193KIP-72: Allow putting a bound on memory consumed by Incoming request 1.0.0
193194KIP-71: Enable log compaction and deletion to co-exist0.10.1.0
194195KIP-70: Revise Partition Assignment Semantics on New Consumer's Subscription Change0.10.1.0
195196KIP-67: Queryable state for Kafka Streams0.10.1.0
196197KIP-66: Single Message Transforms for Kafka Connect0.10.2.0 / 0.11.0.0
197198KIP-65: Expose timestamps to Connect0.10.1.0
198199KIP-63: Unify store and downstream caching in streams0.10.1.0
199200KIP-62: Allow consumer to send heartbeats from a background thread0.10.1.0
200201KIP-60 - Make Java client classloading more flexible0.10.1.0
201202KIP-58 - Make Log Compaction Point Configurable0.10.1.0
202203KIP-57 - Interoperable LZ4 Framing0.10.0.0
203204KIP-56: Allow cross origin HTTP requests on all HTTP methods0.10.0.0
204205KIP-55: Secure Quotas for Authenticated Users0.10.1.0
205206KIP-54: Sticky Partition Assignment Strategy0.11.0.0
206207KIP-52: Connector Control APIs0.10.0.0
207208KIP-51 - List Connectors REST API0.10.0.0
208209KIP-50 - Move Authorizer to o.a.k.common package0.10.1.0
209210KIP-48 Delegation token support for Kafka1.1.0
210211KIP-45 - Standardize all client sequence interaction on j.u.Collection.0.10.0.0
211212KIP-43: Kafka SASL enhancements0.10.0.0
212213KIP-42: Add Producer and Consumer Interceptors0.10.0.0
213214KIP-41: Consumer Max Records0.10.0.0
214215KIP-40: ListGroups and DescribeGroup0.9.0.0
215216KIP-38: ZooKeeper Authentication0.9.0.0
216217KIP-36 - Rack aware replica assignment0.10.0.0
217218KIP-35 - Retrieving protocol version0.10.0.0
218219KIP-33 - Add a time based log index0.10.1.0
219220KIP-32 - Add timestamps to Kafka message0.10.0.0
220221KIP-31 - Move to relative offsets in compressed message sets0.10.0.0
221222KIP-28 - Add a processor client0.10.0.0
222223KIP-26 - Add Kafka Connect framework for data import/export0.9.0.0
223224KIP-25 - System test improvements0.9.0.0
224225KIP-22 - Expose a Partitioner interface in the new producer0.9.0.0
225226KIP-21 - Dynamic Configuration0.9.0.0 (WIP)
226227KIP-20 Enable log preallocate to improve consume performance under windows and some old Linux file system0.9.0.0
227228KIP-19 - Add a request timeout to NetworkClient0.9.0.0
228229KIP-16 - Automated Replica Lag Tuning0.9.0.0
229230KIP-15 - Add a close method with a timeout in the producer0.9.0.0
230231KIP-13 - Quota Design0.9.0.0
231232KIP-12 - Kafka Sasl/Kerberos and SSL implementation0.9.0.0
232233KIP-11 - Kafka Authorizer design0.9.0.0
233234KIP-8 - Add a flush method to the producer API0.9.0.0
234235KIP-4 - Metadata Protocol Changes0.10.0.0
235236KIP-4 - Command line and centralized administrative operations0.9.0.0, 0.10.0.0, 0.10.1.0
236237KIP-3 - Mirror Maker Enhancement0.9.0.0
237238KIP-2 - Refactor brokers to allow listening on multiple ports and IPs0.9.0.0
238239KIP-1 - Remove support of request.required.acks0.9.0.0

...

KIPComment
KIP-59: Proposal for a kafka broker commandSent emails to Dev discussion group. Work tracked under KAFKA-3663.
KIP-125: ZookeeperConsumerConnector to KafkaConsumer Migration and Rollback 
KIP-131 - Add access to OffsetStorageReader from SourceConnector 
KIP-135 : Send of null key to a compacted topic should throw non-retriable error back to user 
KIP 141 - ProducerRecord & SourceRecord: Add timestamp constructors 
KIP-142: Add ListTopicsRequest to efficiently list all the topics in a cluster 
KIP-148: Add a connect timeout for client 
KIP-158: Kafka Connect should allow source connectors to set topic-specific settings for new topics 
KIP-159: Introducing Rich functions to Streams 
KIP-165: Extend Interactive Queries for return latest update timestamp per key

 

KIP-166 - Add a tool to make amounts of replicas and leaders on brokers balanced 
KIP-169 - Lag-Aware Partition Assignment Strategy 
KIP-178: Size-based log directory selection strategy

 

KIP-185: Make exactly once in order delivery the default producer setting

 
KIP-193: Add SchemaBuilder.from(Schema) 
KIP-199: Add Kafka Connect offset tool 
KIP-201: Rationalising Policy interfaces 
KIP-209: Connection String Support 
KIP-213 Support non-key joining in KTable 
KIP-216: IQ should throw different exceptions for different errors 
KIP-217: Expose a timeout to allow an expired ZK session to be re-created 
KIP-221: Repartition Topic Hints in Streams 
KIP-228 Negative record timestamp supportVoting in progress
KIP-234: add support for getting topic defaults from AdminClient 
KIP-236: Interruptible Partition Reassignment 
KIP-240: AdminClient.listReassignments() AdminClient.describeReassignments() 
KIP-242: Mask password in Kafka Connect Rest API response 
KIP-248 - Create New ConfigCommand That Uses The New AdminClientVoting in progress (pending on more binding votes)
KIP-250 Add Support for Quorum-based Producer Acknowledgment 
KIP-252 - Extend ACLs to allow filtering based on ip ranges and subnets 
KIP-253: Support in-order message delivery with partition expansion Discussion
KIP-254: JsonConverter Exception Handeling 
KIP-258: Allow to Store Record Timestamps in RocksDBdepends on KIP-268
KIP-259: Improve Streams DSL Timestamp Propagation Semantics 
KIP-260: add primary join operation for Stream-Stream join (WIP)Draft
KIP-262: Metadata should include number of state stores for taskdepends on KIP-268
KIP-264: Add a consumer metric to record raw fetch sizeVoting in progress
KIP-271: Add NetworkClient redirectorDiscussion
KIP-273: Kafka to support using ETCD beside ZookeeperDiscussion
KIP-275 - Indicate "isClosing" in the SinkTaskContextVoting in progress
KIP-280: Enhanced log compactionDiscussion

KIP-291: Separating controller connections and requests from the data plane

Accepted
KIP-293 Add new metrics for consumer/replication fetch requestsVoting in progress
KIP-296: Add connector level configurability for producer/consumer client configs Discussion
KIP-300: Add Windowed KTable API in StreamsBuilderDiscussion
KIP-301: Schema Inferencing for JsonConverterDiscussion
KIP-304: Connect runtime mode improvements for container platformsDiscussion
KIP-314: KTable to GlobalKTable Bi-directional JoinDiscussion
KIP-315: Stream Join Sticky AssignorDiscussion
KIP-316: Command-line overrides for ConnectDistributed worker propertiesDiscussion
KIP-317: Add transparent data encryption functionalityDiscussion
KIP-320: Allow fetchers to detect and handle log truncationDiscussion
KIP-325: Extend Consumer Group Command to Show Beginning OffsetsVoting in Progress
KIP-326: Schedulable KTable as Graph sourceDiscussion
KIP-333: Add faster mode of rebalancingDiscussion
KIP-334 - Include partitions in exceptions raised during consumer record deserialization/validation
KIP-335: Consider configurations for KafkaStreams

Discussion

KIP-345: Introduce static membership protocol to reduce consumer rebalances
KIP-346 - Improve LogCleaner behavior on error
KIP-347: Enable batching in FindCoordinatorRequestDiscussion
KIP-348 Eliminate null from SourceTask#poll()
KIP-350: Allow kafka-topics.sh to take brokerid as parameter to show partitions associated with it
KIP-351: Add --under-min-isr option to describe topics commandDiscussion
KIP-354: Add a Maximum Log Compaction LagDiscussion
KIP-356: Add KafkaConsumer fetch-error-rate and fetch-error-total metricsDiscussion
KIP-360: Improve handling of unknown producerDiscussion
KIP-362: Support Dynamic Session WindowDiscussion
KIP-363: Allow performance tools to print final results to output fileDiscussion
KIP-370: Remove Orphan PartitionsDiscussion
KIP-373: Allow users to create delegation tokens for other usersDiscussion
KIP-374: Add '--help' option to all available Kafka CLI commandsDiscussion
KIP-375: Kafka Clients - make Metadata#TOPIC_EXPIRY_MS configurableDiscussion
KIP-376: Implement AutoClosable on appropriate classes that want to be used in a try-with-resource statementAccepted
KIP-378: Enable Dependency Injection for Kafka Streams handlersDiscussion

KIP-379: Multiple Consumer Group Management

Discussion
KIP-381: Connect: Tell about records that had their offsets flushed in callback

Discussion, JIRA exists with pull-request

KIP-382: MirrorMaker 2.0Discussion
KIP-383:  Pluggable interface for SSL FactoryDiscussion
KIP-385: Avoid throwing away prefetched dataDiscussion
KIP-386: Make Min metrics' default value consistent with Max metricsDiscussionKIP-387: Fair Message Consumption Across Partitions in KafkaConsumer

Discussion

KIP-388: Add observer interface to record request and responseDiscussion

...