community: deprecate community ollama integrations (#26733)

libs/community/langchain_community/embeddings/ollama.py

@@ -2,12 +2,18 @@ import logging
 from typing import Any, Dict, List, Mapping, Optional
 
 import requests
+from langchain_core._api.deprecation import deprecated
 from langchain_core.embeddings import Embeddings
 from pydantic import BaseModel, ConfigDict
 
 logger = logging.getLogger(__name__)
 
 
+@deprecated(
+    since="0.3.1",
+    removal="1.0.0",
+    alternative_import="langchain_ollama.OllamaEmbeddings",
+)
 class OllamaEmbeddings(BaseModel, Embeddings):
     """Ollama locally runs large language models.