Release Hermes v1.9.0 (informalsystems#4014)

* Create v1.9.0 section in CHANGELOG.md

* create .changelog for v1.9.0

* Update versions in repository

* Fix typos

* Update Cargo.lock

* Fix test-stable

* Update msrv

* Update MSRV in README

* Update CHANGELOG.md

Co-authored-by: Romain Ruetschi <romain@informal.systems>
Signed-off-by: Luca Joss <43531661+ljoss17@users.noreply.github.com>

* Reordered changelog sections to be Breaking Changes, Features, Improvements and then Bug Fixes

---------

Signed-off-by: Luca Joss <43531661+ljoss17@users.noreply.github.com>
Co-authored-by: Romain Ruetschi <romain@informal.systems>

.changelog/unreleased/breaking-changes/ibc-telemetry/3878-remove-telemetry-flag.md → .changelog/v1.9.0/breaking-changes/ibc-telemetry/3878-remove-telemetry-flag.md

@@ -1,3 +1,3 @@
 - Remove the `telemetry` and `rest-server` feature flags, ensuring Hermes is always built with telemetry and REST support.
-  Both servers can still be disabled in the configuration file, by setting `telemtry.enabled = false` and `rest.enabled = false`, respectively.
+  Both servers can still be disabled in the configuration file, by setting `telemetry.enabled = false` and `rest.enabled = false`, respectively.
   ([\#3878](https://github.com/informalsystems/hermes/pull/3878))

.changelog/unreleased/features/ibc-relayer/3894-continue-event-sourcing.md → .changelog/v1.9.0/features/ibc-relayer/3894-continue-event-sourcing.md

@@ -1,4 +1,4 @@
-- Improve reliabily of event source in `pull` mode by proceeding to next block even if Hermes cannot parse the current block.
+- Improve reliability of event source in `pull` mode by proceeding to next block even if Hermes cannot parse the current block.
   Add new configuration option to `event_source` setting: `max_retries` defines how many times Hermes should attempt to pull a block over RPC.
   ```toml
   event_source = { mode = 'pull', interval = '1s', max_retries = 4 }

.changelog/v1.9.0/summary.md

@@ -0,0 +1,11 @@
+*May 30th, 2024*
+
+This v1.9.0 release introduces new features and improvements to Hermes.
+
+**Major Features**:
+
+1. Channel Upgrade Compatibility: Hermes now supports channel upgrade events introduced in ibc-go v8, ensuring smoother transitions and enhanced functionality.
+
+3. Dynamic Gas Fees Compatibility: Hermes is now compatible with Skip's feemarket for dynamic gas fees, in addition to Osmosis' implementation, providing more flexibility in gas fee management.
+
+Additionally, this release includes various bug fixes enhancing the stability and performance of Hermes. These fixes address issues with channel and connection creation on unsupported ibc-go versions, event extraction, health-check messages, and more.

CHANGELOG.md

@@ -1,5 +1,80 @@
 # CHANGELOG
 
+## v1.9.0
+
+*May 30th, 2024*
+
+This v1.9.0 release introduces new features and improvements to Hermes.
+
+**Major Features**:
+
+1. **Channel Upgrades:** Hermes now handles [channel upgrade](https://www.ibcprotocol.dev/blog/introducing-ibc-channel-upgradability) events introduced in ibc-go v8, helping chains opting-in to new functionality on existing channels.
+2. **Dynamic Gas Fees Compatibility:** Hermes is now compatible with Skip's `x/feemarket` module for dynamic gas fees, in addition to Osmosis' implementation, providing more flexibility in gas fee management.
+
+Additionally, this release includes various bug fixes enhancing the stability and performance of Hermes. These fixes address issues with channel and connection creation on older ibc-go versions, event extraction, health-check messages, and more.
+
+### BREAKING CHANGES
+
+- [Telemetry & Metrics](telemetry)
+  - Remove the `telemetry` and `rest-server` feature flags, ensuring Hermes is always built with telemetry and REST support.
+    Both servers can still be disabled in the configuration file, by setting `telemetry.enabled = false` and `rest.enabled = false`, respectively.
+    ([\#3878](https://github.com/informalsystems/hermes/pull/3878))
+
+### FEATURES
+
+- [Relayer Library](relayer)
+  - Add support for upgrading channels, as per the [ICS 004 specification](https://github.com/cosmos/ibc/blob/main/spec/core/ics-004-channel-and-packet-semantics/UPGRADES.md) ([#3228](https://github.com/informalsystems/hermes/issues/2547))
+    This feature allows chains to upgrade an existing channel to take advantage of new features without having to create a new channel, thus preserving all existing packet state processed on the channel. For example, a channel could now be upgraded to enable the [ICS 029 fee middleware](https://ibc.cosmos.network/main/middleware/ics29-fee/overview), allowing relayer operators on that channel to receive fees each time they relay an incentivized packet.
+  - Improve reliability of event source in `pull` mode by proceeding to next block even if Hermes cannot parse the current block.
+    Add new configuration option to `event_source` setting: `max_retries` defines how many times Hermes should attempt to pull a block over RPC.
+    ```toml
+    event_source = { mode = 'pull', interval = '1s', max_retries = 4 }
+    ```
+    ([\#3894](https://github.com/informalsystems/hermes/issues/3894))
+
+### IMPROVEMENTS
+
+- [Integration Test Framework](tools/test-framework)
+  - Update the version of Juno running the integration tests in the CI from `v17.1.1`
+    to `v21.0.0` ([\#3959](https://github.com/informalsystems/hermes/issues/3959))
+  - Update the version of Migaloo Chain running the
+    integration tests in the CI from `v3.0.2` to `v4.1.3`
+    ([\#3960](https://github.com/informalsystems/hermes/issues/3960))
+  - Update the version of `wasmd` running the
+    integration tests in the CI from `v0.30.0` to `v0.50.0`
+    ([\#3961](https://github.com/informalsystems/hermes/issues/3961))
+  - Update the version of ibc-go simapp running the
+    integration tests in the CI from `v8.2.0` to `v8.3.1`
+    ([\#4009](https://github.com/informalsystems/hermes/issues/4009))
+- [Relayer Library](relayer)
+  - Update to tendermint-rs v0.35.0
+    ([\#3895](https://github.com/informalsystems/hermes/issues/3895))
+  - Use `packet_ack_hex` event attribute instead of deprecated `packet_ack` attribute to decode `WriteAck` event
+    ([\#3921](https://github.com/informalsystems/hermes/issues/3921))
+  - Update to tendermint-rs v0.36.0
+    ([\#3966](https://github.com/informalsystems/hermes/issues/3966))
+  - Add support for dynamic gas fee for chains using Skip's [`x/feemarket`](https://github.com/skip-mev/feemarket) module, while keeping compatibility with Osmosis' bespoke implementation
+    ([\#4000](https://github.com/informalsystems/hermes/issues/4000))
+- [Relayer CLI](relayer-cli)
+  - Use RPC (pull) event source instead of WebSocket (push) when generating configuration with `hermes config auto`
+    ([\#3913](https://github.com/informalsystems/hermes/issues/3913))
+
+### BUG FIXES
+
+- [Relayer Library](relayer)
+  - Fix creation of channels and connection on chains
+    using an unsupported version of ibc-go, eg. Sei
+    ([\#3817](https://github.com/informalsystems/hermes/issues/3817))
+  - Fix a bug where Hermes would only ever extract the first emitted ICS 031 CrossChain Query event, which would cause it to miss the other CCQ events.
+    ([\#3954](https://github.com/informalsystems/hermes/issues/3954))
+- [Relayer CLI](relayer-cli)
+  - Fixed `minimum-gas-prices` health-check messages and make it more verbose and legible
+    ([\#3893](https://github.com/informalsystems/hermes/issues/3893))
+  - Set `compat_mode` for pull mode in `hermes listen` command
+    ([\#3910](https://github.com/informalsystems/hermes/issues/3910))
+  - Fixed the trusted height consensus state query when submitting the double vote evidence
+    ([\#3999](https://github.com/informalsystems/hermes/issues/3999))
+
 ## v1.8.3
 
 *May 28th, 2024*