update changelog

dfinity · Oct 4, 2023 · 777e584 · 777e584
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 ## Changelog {#changelog}
 
 ### ∞ (unreleased)
+* Add metrics on subnet usage into the certified state tree and a new HTTP endpoint `/api/v2/subnet/<subnet_id>/read_state` for retrieving them.
+
+### 0.21.0 (2023-09-18) {#0_21_0}
 * Canister cycle balance cannot decrease below the freezing limit after executing `install_code` on the management canister.
 * System API calls `ic0.msg_caller_size` and `ic0.msg_caller_copy` can be called in all contexts except for (start) function.
 * Added note on confidentiality of values in the certified state tree.